I have a C180 and when I release the parking brake by pulling the lever, the actual pedal and parking brake release ok, but the red parking light on the dashboard stays on and emits a warning every time i drive, when i move the parking brake pedal backwards, the red light on the dash goes out. Had it in to a mechanic and he has no idea. Does anyone know if this is an easy job to do, what part is required? Many Thanks