To move the rear brake piston in so that you can fit the new pads, you have to undo the bolt on the back of the caliper, the one obove the bolt that holds the bracket for the parking brake cable, once this is removed, use a 4 or 5mm allen key and turn the adjuster anti-clockwise until the piston moves in until it's in far enough to fit the new pads, once the pads are in and the caliper is fastened, adjust the pads by turing the alle key clokwise until the pads starts to rub up against the disk....that should sort it out.
Get a c clamp to wind it in if that dont work id say its hooped,seized or somthing get a new caliper
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