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It is not at all unusual for the rear brakes to wear more quickly than the front brakes on late model vehicles. To balance out the braking and counter front end dive, the ABS module proportions a significant amount of brake pressure to the rear. The strategy is much more aggressive than old school mechanical metering and proportioning valves, which in many cases would have the rear drum brakes last multiple times longer than the front, as the rear was doing very little actual braking.