Strut Top Mount

It isolates noise and vibration with rubber. It carries part of the vehicle weight. It is often replaced together with shock absorbers. On many cars the top mount bolts are accessible under the bonnet or in the boot, but replacing it needs a spring compressor, which must be used carefully because the compressed spring stores a lot of energy. Fitting new mounts with new shock absorbers restores both comfort and noise isolation.

The bearing lets the spring and strut turn as the wheels steer.

Worn mounts cause knocking over bumps and creaking when steering. A seized bearing can make steering feel notchy.