calipers

Is this probem common on rear discs? On a regular basis I get a loud clunck from the rear dics when I reverse after I've released the handbrake. Is there anyway that I can carryout preventative maintenance to reduce this problem.

Anyone had any problems with there brembos seizing? I changed my pads today and noticed un-even ware on the off-side caliper on the inside pad! It was very stiff to push the pistons back into the caliper! Not sure if it's just a one off or its getting sh!t up inside :( Would it be a...