Hi there im a proud new owner of an a4 1.8 it has a knock when hitting bumps, after investigation (by me) I think it might be the suspension arm at the bottom to the rear, the ball joint is fine but i think it might be the bush. It happens im rolling or braking but doesnt knock when accelerating over bumps, also when i kick front of the tyre/wheel it moves a fair bit, i have ordered those bits £50 for the 2 delivered hoping it sounds like ive got it right?