Last few weeks I noticed a squealing sound coming from the rear. Sometimes it was there, other times no sound. I checked the brakes earlier and could not see much wrong, but due to time decided to look properly today. Went to a friends garage and got the car on the spare lift. The pads had about 40% left, except the inner pad with the wear indicator which wore at an angle. This was due to my friends not lining up the piston slots, with the pins on the pad. Since the car was already up on the lif