I've put new brake pads in, new 16in wheels, but that's about it, factory rotors and calipers. Unfortunately I have no idea whether the problem was present before I bought the car as it wasn't running, only just got it on the road and noticed it when I took it for a drive. Not too sure what other information i can give you Obviously not a common fault. Guess I might have to hang my head in shame and drag my car off to a steering shop