Ford Repair: 1999 Mustang GT-Rear Brakes, rear brakes, mustang gt

Question
I have been doing brake jobs for years. When i removed the calipers to replace the rear pads, i of course got a C clamp to compress the piston into the caliper so the new pads would fit. Except the pistons don't move. Am I missing something ? Do I need to unscrew the brake lines and completely bleed the lines. There is no way the pads fit on unless the piston is compressed. Thanks for the help.

Answer
Tim-

  The rear calipers won't retract with a C clamp like the fronts do.  You'll have to screw them back into place.  If you're particularly inventive you can do this with common hand tools, but I recommend buying a specific ratchet attachment for the job.  they usually cost around $10 at the parts store.  Hope this helps.

Steve