It is normal for the pads to drag a little especially when new. But under normal conditions the disc should not get so hot you can't touch it. Sometimes when pads are changed and the pistons are pushed back into the calipers gunk gets trapped and causes the pistons to stick. When you put in new pads (front or rear) it is a good idea to extend the pistons a little and scrub out the caliper with brake cleaner before pushing them back in.
well the brake is still draging so i took the caliper apart and clean i and clean the piston .and it still drags.the brake pedal feels funny and is hard to stop and no air is in the line.so im going to replace the rear mastercylinder
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