BMW E39 528i: Front Control Arm Insight
I was experiencing a slight shimmy whenever I braked hard at speeds in excess of 40mph. It felt like brake judder, but was intermittent, not at low speed. When I jacked up the car, I could move the front left wheel toe-in/toe-out about a quarter of an inch. An inspection from underneath while my wife moved the wheel showed that the ball joint into the left knuckle was worn and moving. Figuring that if the left one was bad, the right one probably would fail soon, I replaced both.