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You can use a large C-Clamp to compress the caliper piston.
you take out the 2 bolts that mount the caliper to the caliper mount. Then you take a small pry bar and push the brake pad closest to the caliper piston so you can get the caliper off, if it doesn't just slide off. then you take one of the old brake pad and a vice grip clamp, you put the brake pad in front of the piston and put the clamp on the brake pad and the back of the caliper and clamp it down until it will fit over the rotor with the new pads on.
There not like the front calipers where you put a c-clamp on the piston and squeeze them in, on the rear calipers you have to get a special tool from the parts store and as you push inward you have to turn them in.
If it is the front brake use a "C" clamp to retract piston If it is the rear and the parking brake is used by this caliper piston is threaded and a special tool (not expensive) available at Sears or auto parts to "screw" piston into caliper body
Use a "C" clamp to collapse the caliper piston. Use one of the old pads across the face of the piston. If you use the clamp on the bottom of the piston it is possible to crack the piston. Using the old pad spreads the pressure to both sides of the piston. That is if the piston is a cup. If it is solid on the face then it screws in, but I believe this type is only used on the rear brakes of cars.
If you can't compress the piston with a C clamp back in to position to fit the new brake pads I would suggest replacing the caliper completely.
Use a "c" clamp (front) to slide piston into caliper body Rear piston is threaded and requires a special tool to screw piston into caliper body Tool not expensive and available at Sears or auto parts
caliper piston does not retract with moderate C-clamp pressure - not willing to force it
jack and support vehicle Remove wheel Re-intall 2 lug nuts to hold rotor in place Remove caliper mounting bolts (2) Slide caliper off rotor use a "C" clamp to fully depress piston into caliper body Replace inner and outer pads Re-Install caliper DEPRESS BRAKE PEDAL TO SET PADS AGAINST ROTOR PRIOR TO MOVING VEHICLE Re-install wheel
Remove wheel, remove the two bolts that hold the caliper to the bracket, use a C-clamp to compress the piston back into the back caliper and then remove from the rotor.
Just a "c" Clamp to retract piston into caliper body, and a 3/8 Allen socket/wrench to remove the caliper bolts
You need a tool that can compress the piston at the same time you can rotate the caliper clockwise. Or you can use a clamp and a screwdriver to gently compress the piston.