It should be 3/8" if it's a hex, or T-50 if it's a star (Torx).
Use a "C" Clamp to fully retract the piston into the caliper body
Should be the "peel off" type Remove wheel Remove caliper mounting bolts Slide caliper off rotor Rotor should slid off hub
there are 2 ways on is with the C- Clamp. when tightening the clamp loosen the bleeder valve. the second is have to use the caliper tool to screw in the piston steve@spider-technologies.com
The rear piston has to be turned in, it won't just push in, they make a tool at the parts store that makes it easier, if you have tried turning it in and it won't go you will have to replace the caliper as it's bad.
Remove lower caliper bolt (actually the upper one is a pin), lift the caliper, replace pads. The clips and the bracket might however need some cleaning.
Usually you can put a screwdriver between the edge of the rotor and the caliper and pry up on it. Stuck from rust, heat, or piston in caliper will not release? Rust, heat, it will pry up. Not releasing, open bleeder screw if possible without breaking it off.
If it is the front ones, remove the wheel, get a t-50, or t-55 torx for a half in. ratchet. remove the upper and lower bolts, caliper slides off. If it is rear, remove wheel, get an 18mm wrench and take the bolts out. caliper will come out with them.
what i would do is get some wd40 a pry bar and pry tht sucker right off.(you may need a new rotor after that or at least resurface yours)
e brake
same as on all disc break pad changes, but you must have special tool to depress caliper. a c clamp will not work. must have tool to put onto 3/8 in. drive socket and turn clockwise and this will depress caliper. replace pads, bleed and this was the most challenging part of the job.
Remove pad caliper, then caliper holding frame. Disc will come off now. -Re-assemble in reverse order.
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