I have bee getting a constant knocking on the right side of my E200 Kompressor 2005 model. The knock starts mainly when I am in heavy traffic. I have already changed the ball joints and the ends. The knocking sounds as though its a cradle arm bushing wear but it is not - occurs when i turn the steering slightly, when I release my foot from the brake pedal and if i go over a slight bump on the road. It is annoying and infuriating. I need help on this one - my mechanic has tried without any luck. thanks for any suggestions that are forthcoming.