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You should only need to remove the rear bolts from the caliper slides. Once they are out the caliper and pads will pull backward off the caliper carrier. Sometimes you need to slip a screwdriver or small prybar between the caliper frame and the body of the caliper in order to get it loose- the pads have an adhesive backing on them, so they will stick to the caliper body, and if there is a lip on the rotors that will hang it up slightly as well
In order to reset the rear piston, you need to have a special tool that will both compress the piston and rotate it in clockwise as it is compressing- do NOT use a channelock pliers or anything on the caliper piston as it will be damaged and tear up the seals
If the pads are haning up soemtimes you can stick a prybar between the backing plate of the pad and the rotor and give it a slight leverage to push the piston in enough for the pads to clear the rotor lip