I've done only two JK brake jobs but both of them required one rear caliper replacement and the side that did not had decidedly more wear than the front set. I think Sue is right, it has to do with the traction control. I also noticed that with a 35 inch tires the traction control will trigger in a turn more often, myself and another guy that has run 35's have noticed this. I have not noticed it with the 31.5's on the new ride though. Also, back brakes can be a PITA because the e break will eventually trap the rotor on with corrosion. Takes a big hammer a lot of patience and a cool head!