Oldsmobile/Buick Repair: rear disc brakes/95 Buick Riveria Supercharged, rear disc brakes, buick riveria

Question
In installing new brake shoes, the piston head will not retract back into the calipher. The previous shoes were well worn. Also there is not a gripable surface to use a c-clamp. What can I do?

Answer
hey donnie.this car has screw type calipers you need to screw the piston clockwise while at same time pressing down.on piston.to adjust pump park brake.this is a complicated brake system follow these directions and you will get it repaired  please rate my service ty billymac