And, I bet the 164 drives and handles like no other car you've had before
To retract the piston on the rear caliper, you need to put pressure on the piston while turning it clockwise. Use your C clamp to put a little pressure on it, then very carefully, use vise grips to turn the piston. There is also a special tool to do this. If it doesn't turn fairly easily, it make be seized. These things are very difficult to repair if seized. It's best to get a rebuilt set if they are.