A major problem which I discovered on some P500 is the rear brakes locking up with little brake pedal movement. Problem was fixed after replacing the rear brake shoes. This took 5 times to write up as the contractor said this was normal and adjusted them a few times. After replacing the shoes, the brakes were lost on the rear when the fluid leaked out. Refuse to drive a locking vehicle as you'll be at fault in an accident even though it was the brakes fault. Goodluck!!