Ok well me and a tec did the brake job sat on my car..We had to go get new brakets and slide pins for the back..I put on new pads and rotors..The piston was kinda hard to turn at frist but it went back in..But the slide pins where just gone rusted one is stuck we beat it on the floor and wouldnt move it came off the drivers side and i still have a sound form the back drivers side with all new parts..So could the caliper it self be bad?