Can someone tell me how you change the rear brake pads on a 95 contour? I originally tried to push the piston in as in most cars but then found out you should screw it in using a special tool attachment. When I tried to use the tool attachement the piston would screw in very little, not enough to allow the new pads to fit in the caliper. Is there a special techinque to screw the piston in? Is it possible the pistons froze and need calipers to be replaced? If that was the case would the rear brakes still work or does a frozen pistion mean it won't work at all or can it be frozen only in one direction? Thank you for any advice, I hate to take it to a shop where I'll be charged an arm and a leg if I need to have calipers replaced, etc.