That is perfectly normal. Under braking, a large portion of the vehicle weight is transfered to the front (inertia force). As a result, over time the front pads/rotors do wear much faster than the rear. Front/rear brake bias is induced in order to prevent the rear wheels from locking (easier to lock than the front because unloaded). Putting more pressure on the rear brakes will likely not improve your overall braking power. Most of the labor still has be performed by the front.05 silvy 2wd Crew cab... is it possible to adjust the brake proportioning valve? I'm on my 3rd set of rotors in 2 years (70k) I think that I'm getting too much line presure at the fronts and rears aren't taking their share of the braking load..