BMW Thrust Arm Bushings are responsible for dampening most of the back-and-forth
movement of the front wheels of your BMW and provide stability when braking. When they wear out, they can make clunking sounds as you hit the brakes and can also cause a vibration. The bushings contain oil-filled rubber mounts that over time can weaken and crack, resulting in a sloppy quality or steering wheel vibration while going over bumps. If you’re curious whether your Thrust Arm Bushings are bad, have someone stand outside of the car (at a safe distance) and hit the brakes to decelerate. When thrust arm bushings go bad, you can visibly see that the wheel will move forward or backward instead of remaining stable while coming to a stop.