I have a 03 S500 4 matic in the shop and they cant figure out the problem. I have squeaking noise coming when the car is warmed up and I hit the brakes at very low speed, from what I thought was the brake area in the front of my car. Took it to the dealer they originally thought it was the ball joints or the brakes and they are now saying its niether of those problems and they are having trouble diagnosing the problem. Anyone have an idea of what it could be??