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Even though Robert’s ‘13 Mustang GT was a new car, the rear brake pads had worn enough to require the calipers to be spread apart to make room for the new pads. The brake calipers use a screw-type piston. Don’t try to compress them with a c-clamp; you have to turn the piston to get it to retract. There is a special tool available for rent at most auto parts retailers (shown here) or you can gently use a large flat screwdriver and a rubber hammer to ease the calipers back into position.