Passenger side rear brake caliper has seized on the inside of disc, no pad left, just left with the backing plate going straight onto the disc, so got tiny metal shavings stuck on the wheel and rear side of bumper. Changing the dics and pads this weekend, done it before but don't know how I will sort the sticking caliper out, anyone got any ideals? Also how do I get the metal shavings off the bumper without damaging the paintwork?