Working on a '99 Camry. Left front brake caliper was replaced about 2 years ago. Replacing rotors and pads. Trying to push piston in to make room for new pads. The original caliper was fine. Just loosened brake bleeder and used C Clamp to push the piston down. No problem. The left front caliper that was replaced won't budge. It will drip after I loosen the brake bleeder screw but that is it. I actually removed the brake bleeder screw but all it would do is drip. I think I tore a muscle trying to twist the C Clamp so hard. Now to give more info. The reason I am replacing the rotors is because the shakes when applying the brakes. Could this stuck piston be her problem with the rotors warping? Any suggestions? New Caliper?