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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.
But wait that's not all. If you look closely at the below picture you'll find a black part too that runs inside the spring. This is a shock absorber/damper which is also a part of vehicle suspension setup. In short : The coil springs help in energy absorption whilst the dampers help in energy dissipation. Had there been no dampers and only springs the vehicle would have continued to oscillate back and forth until the vibrations died out of natural damping.