{"id":28446,"date":"2025-05-24T09:46:14","date_gmt":"2025-05-24T02:46:14","guid":{"rendered":"https:\/\/thacoindustries.com\/?p=28446"},"modified":"2026-04-11T15:47:12","modified_gmt":"2026-04-11T08:47:12","slug":"what-are-truck-leaf-springs","status":"publish","type":"post","link":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/","title":{"rendered":"What Are Truck Leaf Springs? Structure &#038; Maintenance"},"content":{"rendered":"<p>Leaf springs are critical components in a truck\u2019s suspension system, as well as in heavy-duty applications such as <a href=\"https:\/\/thacoindustries.com\/en\/semi-trailer-leaf-springs\/\" target=\"_blank\" rel=\"noopener\"><strong>semi-trailer leaf springs<\/strong><\/a>, where they support higher loads and ensure stability over long-distance transport. They carry vehicle load directly from the frame to the axle, absorb road shocks, and stabilize the vehicle in motion. Understanding their structure and maintenance process helps you select the right components and service procedures when replacements are required.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_75 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">Table of contents (M\u1ee5c l\u1ee5c)<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#What_is_a_truck_leaf_spring\" >What is a truck leaf spring?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Construction_of_a_truck_leaf_spring\" >Construction of a truck leaf spring<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Types_of_truck_springs\" >Types of truck springs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#How_truck_leaf_springs_work\" >How truck leaf springs work<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Signs_your_leaf_springs_need_maintenance\" >Signs your leaf springs need maintenance<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Excessive_vibration_on_rough_roads\" >Excessive vibration on rough roads<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Unusual_noises_from_the_spring_area\" >Unusual noises from the spring area<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Leaves_bent_cracked_or_broken\" >Leaves bent, cracked, or broken<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Vehicle_pulls_or_wanders_while_driving\" >Vehicle pulls or wanders while driving<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Uneven_tire_wear\" >Uneven tire wear<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Ride_height_is_lower_than_normal\" >Ride height is lower than normal<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Leaf_spring_maintenance_procedure\" >Leaf spring maintenance procedure<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Tools_materials\" >Tools &amp; materials<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Inspect_the_leaf_springs\" >Inspect the leaf springs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Clean_the_assembly\" >Clean the assembly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Lubricate\" >Lubricate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Reassemble\" >Reassemble<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#Thaco_Parts_%E2%80%93_Vietnams_leading_trusted_OEM_parts_manufacturer\" >Thaco Parts &#8211; Vietnam\u2019s leading, trusted OEM parts manufacturer<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_a_truck_leaf_spring\"><\/span><span style=\"font-size: 14pt;\"><b>What is a truck leaf spring?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/thacoindustries.com\/en\/product-category\/automobile-parts-components\/\" target=\"_blank\" rel=\"noopener\">Truck leaf springs<\/a> are part of the suspension system. Its primary job is to absorb shocks when the truck travels on rough roads so the vehicle runs smoother and safer on rough surfaces. A leaf spring assembly is made from stacked spring-steel plates, typically arranged from shortest to longest to form a preset camber. More leaves generally deliver a higher spring rate and greater load capacity. When a spring fails, you may see rear-end or front-end instability and uneven tyre wear.<br \/>\n<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Construction_of_a_truck_leaf_spring\"><\/span><span style=\"font-size: 14pt;\"><b>Construction of a truck leaf spring<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A truck leaf spring includes the following main parts:<\/span><\/p>\n<ul>\n<li>Spring leaves (leaf pack): high-tensile spring steel plates stacked to a defined camber.<\/li>\n<li>Spring eye bushings: Polymer or metal sleeves fitted into the eyes at each end of the main leaf, reducing friction and wear between the spring eye and the shackle pin..<\/li>\n<li>Center bolt &amp; clips\/clamps: Secure and align the leaf pack as a unit; prevent lateral shift of the leaves.<\/li>\n<li>U-bolts &amp; fasteners: Clamp the axle to the spring seat and secure the assembly to the chassis.<\/li>\n<li>Shackles &amp; hangers: Connect the spring to the frame and allow for changes in spring length as it deflects under load.<\/li>\n<li>Shock absorbers: Control oscillation transmitted from the spring to the frame.<\/li>\n<\/ul>\n<figure id=\"attachment_17422\" aria-describedby=\"caption-attachment-17422\" style=\"width: 2550px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-17422 size-full\" src=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg\" alt=\"Truck leaf spring assembly in the suspension system reducing road shocks for a smoother ride\" width=\"2560\" height=\"1702\" srcset=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg 2560w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1-300x199.jpg 300w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1-1024x681.jpg 1024w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1-768x511.jpg 768w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1-1536x1021.jpg 1536w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1-2048x1362.jpg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-17422\" class=\"wp-caption-text\">Truck leaf springs belong to the suspension system and primarily absorb shocks for a smoother ride\\<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Types_of_truck_springs\"><\/span><span style=\"font-size: 14pt;\"><b>Types of truck springs<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Multi-leaf springs: The most common for commercial trucks. Strengths: cost-effective, robust, straightforward to service. Trade-off: ride comfort is limited compared with other spring types.<\/li>\n<li>Coil springs (helical): Compact and lightweight, offering good ride quality and resistance to sagging. Trade-off: higher cost in heavy-duty applications and more complex service in some layouts.<\/li>\n<li>Air springs (air bellows): Provide the best ride comfort and height leveling under varying loads. Trade-off: bulkier packaging and more complex service; requires air system integrity.<\/li>\n<li>Parabolic leaf springs: The leaves have a parabolic thickness profile, which reduces interleaf friction and improves comfort while maintaining load capacity. Trade-off: higher cost and more specialized service.<\/li>\n<\/ul>\n<figure id=\"attachment_17424\" aria-describedby=\"caption-attachment-17424\" style=\"width: 2550px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-17424\" src=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-2.jpg\" alt=\"Multi-leaf spring pack \u2014 affordable and easy to service and maintain\" width=\"2560\" height=\"1824\" srcset=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-2.jpg 2560w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-2-300x214.jpg 300w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-2-1024x730.jpg 1024w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-2-768x547.jpg 768w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-2-1536x1094.jpg 1536w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-2-2048x1459.jpg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-17424\" class=\"wp-caption-text\">Multi-leaf springs are cost-effective, easy to repair, and straightforward to maintain.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"How_truck_leaf_springs_work\"><\/span><span style=\"font-size: 14pt;\"><b>How truck leaf springs work<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Leaf springs rely on the elastic deflection of spring steel. When the wheels hit bumps, road forces bend the leaves. The spring compresses, stores energy, and then returns to its original shape, absorbing impact and reducing vibration transmitted to the frame and cab.<\/p>\n<figure id=\"attachment_17426\" aria-describedby=\"caption-attachment-17426\" style=\"width: 2550px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-17426\" src=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3.jpg\" alt=\"Leaf spring flexing under load \u2014 elastic deformation of spring steel\" width=\"2560\" height=\"2560\" srcset=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3.jpg 2560w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3-300x300.jpg 300w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3-1024x1024.jpg 1024w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3-150x150.jpg 150w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3-768x768.jpg 768w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3-1536x1536.jpg 1536w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-3-2048x2048.jpg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-17426\" class=\"wp-caption-text\">Truck leaf springs work through the elastic deflection of spring steel.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Signs_your_leaf_springs_need_maintenance\"><\/span><span style=\"font-size: 14pt;\"><b>Signs your leaf springs need maintenance<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Excessive_vibration_on_rough_roads\"><\/span><span style=\"font-size: 12pt;\"><strong>Excessive vibration on rough roads<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">The most common sign of a spring problem. Because the spring\u2019s job is to absorb shocks, weakened or damaged springs lose effectiveness, causing the vehicle to shake noticeably over rough roads, potholes, or under heavy loads.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Unusual_noises_from_the_spring_area\"><\/span><span style=\"font-size: 12pt;\"><strong>Unusual noises from the spring area<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Noise can occur when dry interfaces rub due to insufficient lubrication, or if leaves are cracked or broken. Investigate immediately when you hear unfamiliar sounds around the spring.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Leaves_bent_cracked_or_broken\"><\/span><span style=\"font-size: 12pt;\"><strong>Leaves bent, cracked, or broken<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">A severe failure mode. If you find bent, cracked, or broken leaves, replace the spring promptly to protect occupants and cargo.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Vehicle_pulls_or_wanders_while_driving\"><\/span><span style=\"font-size: 12pt;\"><strong>Vehicle pulls or wanders while driving<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Leaf springs play a key role in vehicle stability. When they are damaged, the truck may drift off-line, especially when cornering or at higher speeds.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Uneven_tire_wear\"><\/span><span style=\"font-size: 12pt;\"><strong>Uneven tire wear<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">If tires are wearing unevenly, the spring system may be at fault. Weak or damaged springs can distribute weight unevenly across the wheels, accelerating irregular wear.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ride_height_is_lower_than_normal\"><\/span><span style=\"font-size: 12pt;\"><strong>Ride height is lower than normal<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">A fatigued or damaged spring can lose camber, causing the vehicle to sit lower than usual &#8211; an easy sign to spot.<\/span><\/p>\n<figure id=\"attachment_17428\" aria-describedby=\"caption-attachment-17428\" style=\"width: 2550px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-17428\" src=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-4.jpg\" alt=\"Technician inspecting truck leaf springs for wear and damage\" width=\"2560\" height=\"1440\" srcset=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-4.jpg 2560w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-4-300x169.jpg 300w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-4-1024x576.jpg 1024w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-4-768x432.jpg 768w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-4-1536x864.jpg 1536w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-4-2048x1152.jpg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-17428\" class=\"wp-caption-text\">Identify maintenance signs early to keep truck leaf springs performing properly.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Leaf_spring_maintenance_procedure\"><\/span><span style=\"font-size: 14pt;\"><b>Leaf spring maintenance procedure<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Tools_materials\"><\/span><span style=\"font-size: 12pt;\"><strong>Tools &amp; materials<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Vehicle lift or rated jack stands<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Pliers, wrenches, and a socket set<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Hammer<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Stiff brush<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Suitable lubricant<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Clean rags<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Rubber pads or bushings (if needed)<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Inspect_the_leaf_springs\"><\/span><span style=\"font-size: 12pt;\"><strong>Inspect the leaf springs<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Check the following leaf spiring&#8217;s components:<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Inspect leaves for bending, cracks, or breaks.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Ensure leaf spring bolts and center bolt are not loose or corroded.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Check the center bolt and clips\/clamps for wear or damage.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Inspect spring eye bushings for cracking, tearing, or aging.<\/span><\/p>\n<p style=\"padding-left: 40px;\"><span style=\"font-weight: 400;\">&#8211; Examine related suspension parts such as the stabilizer bar and shock absorbers for damage.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Clean_the_assembly\"><\/span><span style=\"font-size: 12pt;\"><strong>Clean the assembly<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Use a brush to remove dirt and mud from the springs, then wipe all components clean with rags.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Lubricate\"><\/span><span style=\"font-size: 12pt;\"><strong>Lubricate<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Apply the appropriate lubricant to moving interfaces and fasteners per OEM guidance. Lubricate evenly and adequately to ensure smooth operation.<\/span><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Reassemble\"><\/span><span style=\"font-size: 12pt;\"><strong>Reassemble<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Reinstall all components in their original positions and torque fasteners to specified values.<\/span><\/p>\n<figure id=\"attachment_17430\" aria-describedby=\"caption-attachment-17430\" style=\"width: 2550px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-17430\" src=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-5.jpg\" alt=\"Cleaning the leaf spring assembly to maintain smooth operation\" width=\"2560\" height=\"1707\" srcset=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-5.jpg 2560w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-5-300x200.jpg 300w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-5-1024x683.jpg 1024w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-5-768x512.jpg 768w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-5-1536x1024.jpg 1536w, https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-5-2048x1366.jpg 2048w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption id=\"caption-attachment-17430\" class=\"wp-caption-text\">Keep the assembly clean to ensure smooth spring operation.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Thaco_Parts_%E2%80%93_Vietnams_leading_trusted_OEM_parts_manufacturer\"><\/span><span style=\"font-size: 14pt;\"><b>Thaco Parts &#8211; Vietnam\u2019s leading, trusted OEM parts manufacturer<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">As a strategic partner to many global automakers, <\/span><a href=\"https:\/\/thacoindustries.com\/en\/field-of-activity\/automotive-components\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">Thaco Parts<\/span><\/a><span style=\"font-weight: 400;\"> (a division of <\/span><a href=\"https:\/\/thacoindustries.com\/en\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">THACO INDUSTRIES<\/span><\/a><span style=\"font-weight: 400;\">) manufactures and supplies OEM components (glass, leaf springs, HVAC units, wiring harnesses, condensers, interior and exterior parts) to automakers such as Kia, Mazda, Peugeot, Toyota, Hyundai, and Isuzu, and exports to markets including the United States, Australia, Russia, Canada, South Korea, Japan, and more.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">THACO Parts\u2019 products comply with IATF 16949:2016, ISO 9001:2015, and ISO 14001:2015. With a deep understanding of global OEM requirements and production processes, THACO Parts develops localization roadmaps aligned with automakers\u2019 standards.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Leaf springs are critical components in a truck\u2019s suspension system, as well as in heavy-duty applications such as semi-trailer leaf springs, where they support higher loads and ensure stability over long-distance transport. They carry vehicle load directly from the frame to the axle, absorb road shocks, and stabilize the vehicle in motion. Understanding their structure &#8230; <a title=\"What Are Truck Leaf Springs? Structure &#038; Maintenance\" class=\"read-more\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\" aria-label=\"More on What Are Truck Leaf Springs? Structure &#038; Maintenance\">Read more<\/a><\/p>\n","protected":false},"author":14,"featured_media":17423,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[703],"tags":[],"class_list":["post-28446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-product-information"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Are Truck Leaf Springs? Structure &amp; Maintenance<\/title>\n<meta name=\"description\" content=\"Leaf springs are critical components in a truck\u2019s suspension system. This guide help you select the right parts and service procedures when replacements are required.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Are Truck Leaf Springs? Structure &amp; Maintenance\" \/>\n<meta property=\"og:description\" content=\"Leaf springs are critical components in a truck\u2019s suspension system. This guide help you select the right parts and service procedures when replacements are required.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\" \/>\n<meta property=\"og:site_name\" content=\"THACO INDUSTRIES\" \/>\n<meta property=\"article:published_time\" content=\"2025-05-24T02:46:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-11T08:47:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1702\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"analytics@artemisdigital.com\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"analytics@artemisdigital.com\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\"},\"author\":{\"name\":\"analytics@artemisdigital.com\",\"@id\":\"https:\/\/thacoindustries.com\/#\/schema\/person\/a88c0a0314c851faf55f26b26b468c9a\"},\"headline\":\"What Are Truck Leaf Springs? Structure &#038; Maintenance\",\"datePublished\":\"2025-05-24T02:46:14+00:00\",\"dateModified\":\"2026-04-11T08:47:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\"},\"wordCount\":1001,\"publisher\":{\"@id\":\"https:\/\/thacoindustries.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg\",\"articleSection\":[\"Product information\"],\"inLanguage\":\"en\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\",\"url\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\",\"name\":\"What Are Truck Leaf Springs? Structure & Maintenance\",\"isPartOf\":{\"@id\":\"https:\/\/thacoindustries.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg\",\"datePublished\":\"2025-05-24T02:46:14+00:00\",\"dateModified\":\"2026-04-11T08:47:12+00:00\",\"description\":\"Leaf springs are critical components in a truck\u2019s suspension system. This guide help you select the right parts and service procedures when replacements are required.\",\"breadcrumb\":{\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#breadcrumb\"},\"inLanguage\":\"en\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en\",\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage\",\"url\":\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg\",\"contentUrl\":\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg\",\"width\":2560,\"height\":1702,\"caption\":\"Truck leaf spring\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/thacoindustries.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What Are Truck Leaf Springs? Structure &#038; Maintenance\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/thacoindustries.com\/#website\",\"url\":\"https:\/\/thacoindustries.com\/\",\"name\":\"THACO INDUSTRIES\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\/\/thacoindustries.com\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/thacoindustries.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/thacoindustries.com\/#organization\",\"name\":\"THACO INDUSTRIES\",\"url\":\"https:\/\/thacoindustries.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en\",\"@id\":\"https:\/\/thacoindustries.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/10\/Untitled-11.png\",\"contentUrl\":\"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/10\/Untitled-11.png\",\"width\":512,\"height\":512,\"caption\":\"THACO INDUSTRIES\"},\"image\":{\"@id\":\"https:\/\/thacoindustries.com\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/thacoindustries.com\/#\/schema\/person\/a88c0a0314c851faf55f26b26b468c9a\",\"name\":\"analytics@artemisdigital.com\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en\",\"@id\":\"https:\/\/thacoindustries.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/e819bf799c6455ab92f96c5796c212449b1be6b138a6dcf9461b7db7a29220ff?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/e819bf799c6455ab92f96c5796c212449b1be6b138a6dcf9461b7db7a29220ff?s=96&d=mm&r=g\",\"caption\":\"analytics@artemisdigital.com\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What Are Truck Leaf Springs? Structure & Maintenance","description":"Leaf springs are critical components in a truck\u2019s suspension system. This guide help you select the right parts and service procedures when replacements are required.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/","og_locale":"en_US","og_type":"article","og_title":"What Are Truck Leaf Springs? Structure & Maintenance","og_description":"Leaf springs are critical components in a truck\u2019s suspension system. This guide help you select the right parts and service procedures when replacements are required.","og_url":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/","og_site_name":"THACO INDUSTRIES","article_published_time":"2025-05-24T02:46:14+00:00","article_modified_time":"2026-04-11T08:47:12+00:00","og_image":[{"width":2560,"height":1702,"url":"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg","type":"image\/jpeg"}],"author":"analytics@artemisdigital.com","twitter_card":"summary_large_image","twitter_misc":{"Written by":"analytics@artemisdigital.com","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#article","isPartOf":{"@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/"},"author":{"name":"analytics@artemisdigital.com","@id":"https:\/\/thacoindustries.com\/#\/schema\/person\/a88c0a0314c851faf55f26b26b468c9a"},"headline":"What Are Truck Leaf Springs? Structure &#038; Maintenance","datePublished":"2025-05-24T02:46:14+00:00","dateModified":"2026-04-11T08:47:12+00:00","mainEntityOfPage":{"@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/"},"wordCount":1001,"publisher":{"@id":"https:\/\/thacoindustries.com\/#organization"},"image":{"@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage"},"thumbnailUrl":"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg","articleSection":["Product information"],"inLanguage":"en"},{"@type":"WebPage","@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/","url":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/","name":"What Are Truck Leaf Springs? Structure & Maintenance","isPartOf":{"@id":"https:\/\/thacoindustries.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage"},"image":{"@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage"},"thumbnailUrl":"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg","datePublished":"2025-05-24T02:46:14+00:00","dateModified":"2026-04-11T08:47:12+00:00","description":"Leaf springs are critical components in a truck\u2019s suspension system. This guide help you select the right parts and service procedures when replacements are required.","breadcrumb":{"@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#breadcrumb"},"inLanguage":"en","potentialAction":[{"@type":"ReadAction","target":["https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/"]}]},{"@type":"ImageObject","inLanguage":"en","@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#primaryimage","url":"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg","contentUrl":"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/05\/Hinh-1.jpg","width":2560,"height":1702,"caption":"Truck leaf spring"},{"@type":"BreadcrumbList","@id":"https:\/\/thacoindustries.com\/en\/what-are-truck-leaf-springs\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/thacoindustries.com\/en\/"},{"@type":"ListItem","position":2,"name":"What Are Truck Leaf Springs? Structure &#038; Maintenance"}]},{"@type":"WebSite","@id":"https:\/\/thacoindustries.com\/#website","url":"https:\/\/thacoindustries.com\/","name":"THACO INDUSTRIES","description":"","publisher":{"@id":"https:\/\/thacoindustries.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/thacoindustries.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en"},{"@type":"Organization","@id":"https:\/\/thacoindustries.com\/#organization","name":"THACO INDUSTRIES","url":"https:\/\/thacoindustries.com\/","logo":{"@type":"ImageObject","inLanguage":"en","@id":"https:\/\/thacoindustries.com\/#\/schema\/logo\/image\/","url":"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/10\/Untitled-11.png","contentUrl":"https:\/\/thacoindustries.com\/wp-content\/uploads\/2024\/10\/Untitled-11.png","width":512,"height":512,"caption":"THACO INDUSTRIES"},"image":{"@id":"https:\/\/thacoindustries.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/thacoindustries.com\/#\/schema\/person\/a88c0a0314c851faf55f26b26b468c9a","name":"analytics@artemisdigital.com","image":{"@type":"ImageObject","inLanguage":"en","@id":"https:\/\/thacoindustries.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/e819bf799c6455ab92f96c5796c212449b1be6b138a6dcf9461b7db7a29220ff?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/e819bf799c6455ab92f96c5796c212449b1be6b138a6dcf9461b7db7a29220ff?s=96&d=mm&r=g","caption":"analytics@artemisdigital.com"}}]}},"_links":{"self":[{"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/posts\/28446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/comments?post=28446"}],"version-history":[{"count":9,"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/posts\/28446\/revisions"}],"predecessor-version":[{"id":32549,"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/posts\/28446\/revisions\/32549"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/media\/17423"}],"wp:attachment":[{"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/media?parent=28446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/categories?post=28446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thacoindustries.com\/en\/wp-json\/wp\/v2\/tags?post=28446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}