Can't depress rear piston on rear brakes to replace pads
If the rear brake calipers have an integrated parking brake in the caliper then you have to use a special tool to turn the caliper piston back in. If you tried to use a c-clamp to push back this style of caliper, then you may have damaged the internal mechanism to the caliper and it will need to be replaced. If the parking brake is not integrated and the caliper piston cannot be pushed back, then the caliper is seized and needs to be replaced. So either way you need to have the calipers replaced if they do not move with the correct way used to push them back.
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