Automotive bearings bushing are small suspension components that reduce friction between metal parts of the vehicle. They are made of a self-lubricating material (usually bronze) and are critical to ensuring a smooth ride. While they are not the only reason you can shake, they are usually the prime suspect. For something that makes such a big difference, bronze bushings are very simple. They consist of just two parts: the outer (usually bronze) bushing and the spongy interior. But, like most suspension components, they don’t last forever.