Rear caliper

In trying to retract the piston on the rear caliper of my '96 Maxima to allow for the new brake pads, it won't go in. I bought the special tool, which is a big help, but the piston just turns and turns and doesn't retract. The rubber accordian-like gasket is a little chewed up around the piston, could this be the problem. I'm dreading taking the caliper apart. . . . Any suggestions?

Thanks

your piston may need to be turned in. if it does not retract in one direction, try it in the other direction. also be sure the e-brake adjustment is not causing the broblem.