Equip your semi truck to be Ready for the Road Ahead™, with the Hendrickson Bolster Spring Service Kit, a key component that works in conjunction with the suspension system. This replacement kit works to return the bolster springs to their original working condition, so that they can once again efficiently distribute the weight of the suspension system. Engineered with a proprietary rubber compound to deliver ideal articulation and ride quality. FleetPride is your First Click in Heavy Duty®.