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Suspension Coil Spring Replacement Service and Cost. What is a coil spring? Coil springs allow the vehicle to absorb bumps, and keep the passenger comfortable. The coil springs hold the weight of the vehicle, and allow the wheels to travel vertically when the wheels encounter an obstacle.
Coil springs can and will become compromised after time. However, depending on their application to the vehicle, many coil springs can last the lifetime of the vehicle. There really is no expiration date on coil springs, but there are a few things to check for when inspecting your suspension. While coil springs support the weight of the vehicle, it's the shocks' or struts' job to prevent the bouncing. Jounce the front suspension (and the rear, for that matter) and count how many bounces occur after you release the vehicle. Two or more full bounces means weak shocks or struts.