hello,,,i have a ford focus estate 2010 1.6 diesel and the rear brakes recently started giving a sort of scraping sound when pressed,,,i automatically thought the pads were worn down and the steel was starting to come through and touch the disc,,,so I checked the pads and they were fine,,,i put a new set in anyway just to be sure,,,still the scraping sound is there when I brake but goes off as soon as I take my foot of the brake,,,the disc on one side is good condition with even wear,,,the one on the other side however is in a bit of a state,,,plenty ridges and very worn,,,even getting a bit steering wheel wobble when I brake also,,,could this be just a warped disc or does it sound like a sticking caliper??? when I changed the pads the piston on the side where the disc is worn was a nightmare to wind back in......anybody???