Can anyone suggest why a single front brake pad on my 2002 E53 has worn differently to the rest. The right wheel pads have worn evenly and are about 4mm now. On the left, the outer pad is the same ,but the inner pad (ie. pushed directly by the caliper piston) has worn at an angle. The outer edge is about 4mm but the inner edge (closest to the hub centre) is down to bare metal. The brakes have behaved normally. No pulling or noises till now, when I heard the scrape of metal to metal. I will obviously change all pads now. The rotors were fairly worn anyway and must also be changed. There must be a reason for the irregular wear and I need to know what I should look for as I replace parts to make sure it does not recur.