RS e-tron GT; Left. A shock absorber is a device that controls the spring oscillations when the vehicle goes over various road irregularities, so the vehicle's tires remain in contact with the road. In some cases, shock absorbers have a secondary function as a suspension limiter to prevent the suspension from either over-extending and/or over-compressing. Air Suspension Spring. From 11/01/2021. To 11/01/2021. Air Suspension. Damper. Strut ASSEMBLY. Suspension Absorber.