Not alot of info. But I suspect you are wondering how to retract the caliper piston so that you can get the new pads in and the whole assy back on the rotor. Since they are "self adjusting" real breaks (that tighten slightly when you use the brake while in reverse) the caliper piston must be rotated counter clockwise while being compressed.
You need to make or buy a special tool.
I got mine at harbor Freight for $20.00. Hope this helps.
New Answerer: I just finished doing this job for a 1990 Cutlass Supreme. I was able to compress the piston by putting gentle pressure on the piston with a 7 or 8 inch C clamp and then rotated the piston CLOCKWISE with Channel Lock pliers for the right rear brakes. (I assume it is counter-clockwise for the left rear.) I got a friend to slowly tighten the clamp while I turned the piston. It is important to use just the edge of the pliers so that the rubber bellows around the piston will not be damaged. I also had to grind the edges of the rotor a little to take off the edges for several inches on each side of the rotor so that the new pad material would not be damaged when the caliper and new pads were slipped over the rotor.
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