Its not my parking brake that's bad, otherwise it would have both rear tires locked. Its my caliper piston. It won't disengage. Its extremely hard to compress, as well as the brake pads were corroded into the clips.
its not designed to push back like the front calipers. the e-brake mechanism is built into the caliper; therefore you must fit a tool into the piston notches and rotate it to move it back. If it doesn't rotate by hand; its seized and replacement is required.