**A common wear item, also known as a hydrobearing** The tension strut bushing acts as a mounting point to the chassis for the tension strut. From the factory BMW uses a liquid filled bushing which helps reduce vibration and harshness. With age this bushing car fail causing alignment and performance issues along with noises from the front suspension. If the tension strut ball joint is still in good shape and the inner bushing has failed you can save some money by replacing this bushing. We recommend replacing this bushing in matched pairs.