Jounce Bumpers and Stops
Jounce bumpers and bump stops absorb the impact when a vehicle bottoms out. The bumpers labeled A in the illustration above fit over strut inserts. They’re foam and hard rubber components that come in many shapes and sizes. They absorb sudden blows as a vehicle travels over potholes and speed bumps in the road.
Bumpers dry out and require replacement, but unfortunately do not always come with replacement parts like struts. In this case they must be ordered separately. Replace jounce bumpers and bump stops whenever they’re worn or missing.
Symptoms of missing and worn bump stops include noise and vibration. This is caused by metal to metal contact while carrying a load or travelling over deep bumps in the road. They fit over shock absorbs and are fastened to control arms and leaf springs to prevent them from fully compressing metal to metal when the vehicle bottoms out.