The only way to retract the piston is to screw the pistons back in with a tool designed to hook up to your 3/8 in ratchet extension and ratchet. I removed the roto and screwed the caliper back in place. Then I vise gripped the caliper to the caliper mounting bar. You must push hard , lean into the ratchet and turn clockwise at the same time to turn the piston in. It takes a numerous revolutions and if you dont lean into it you will get nowhere. Very poor design. Make sure you removed or loosened up the brake fluid resovoir cap.
If you try to "c" clamp with force you will damage the internals of the caliper.
I also am trying ceramic pads since I went thru the originals in 22 K and I am not hard on brakes. Should do better with the ceramics.
GLTA.. | 
