95 240sx s14 rear brake caliper piston problem?

I am in the process of changing the rear brake pads on my s14 and ran into a problem with the left rear caliper. I have the tool for turning the piston in the caliper and have changed the brakes on my s13 many times without any problems. This is the first time changing the pads on this car, and after replacing the pads on the passenger side, I encountered something new when i started on the left side. After spinning the piston clockwise to try and get it seated i found that it wasn't going anywhere. The dimples in the piston looked like the last owner did a number on them and the dust boot was all mangled and loose. Does anyone know how i can get the piston to seat back in? If i remove the piston will i have to bleed the system? by the way, i turned the piston about a quarter turn counter clockwise to see if it would move at all and it did move out a bit.



thanks.95 240sx s14 rear brake caliper piston problem?
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