It should be 3/8" if it's a hex, or T-50 if it's a star (Torx).
Look at the pistons in the caliper. If it is a cup type piston there could be several reasons for this, (requiring researching technical manuals). But if it is a solid piston with what appears to be 4 raised tabs around the piston in a + configuration this suggests that you may need to screw the piston back into the caliper turning it clockwise. Sometimes this takes quite a bit of turning. Otherwise the pistons are stuck, or you might need to open the bleed screws and compress the pistons as some vehicles have one-way pressure valves in the system. . To add a '96 cutlass caliper piston has to be screwed in clockwise with also applying steady pressure
Remove the two bolts holding the caliper over the rotor, remove caliper. You may have to gently persuade it with a dead blow or hammer. Once removed the pads come off by pushing them out. Use a clamp to press the caliper piston back into the caliper or you won't be able to put the caliper back over the rotor with the new pads installed. Now simply work in reverse order installing the pads and caliper, bleed your brakes, and hit the road.
AnswerThere is not enough information in your question. A cylinder piston you do not compress, you compress the rings in the piston. There are pistons in the brake system. There is no way of knowing the problem without being more specific.I'm assuming you mean the caliper piston. If it can't be compressed, replace the caliper.
You need to remove the caliper. Usually there are 2 bolts/pins that go through the calipers, holding them in place. Once the calipers are off, the rotors should come off quite easily. If it's a front wheel vehicle, the rotor should just pull off. If it's a rear wheel vehicle, the rotor is often integral to the wheel bearing and hub. For a rear wheel caliper, just pull the center wheel bearing cotter pin, nut, remove the wheel bearings and pull the rotor.
they must be screwed in because the e=brake is built into caliper. there is a tool kit that uses the grooves on piston but you can use channel lock pliers to turn piston don't chew up dust seal around piston .the right side is clockwise to turn in i think the left is ccw to turn in when piston starts moving in you going the right way. make sure you line the slots on the piston with the pins on the brake pads if not lined up you never get caliper on good luck ps when all done pump and release the e brake 20 time to self adjust the pistons
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