I am having difficulty twisting in the rear piston sufficiently to go over the new pads. It seems like it is stuck. i Torqued it really hard and could not turn it. Do I need a special tool or what?? I even opened the bleeder valve and still could not turn the piston. This is weird . Any advice on 2k rear brake job.THX I

 

Yeah there is a special tool that looks like a cude that fits onto the holes, or you can try and rig it with pliers to compress the caliper.

 

if it is really stuck it might be frozen and has to be replaced.