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If its a rear wheel drive car it would be because more power to that axle, therefore more stopping power is exerted by the brake pads.

When applying braking more forces are exerted on the front of the vehicle, this is why vehicles fitted with only one set of disc brakes (superior to drum) use them on the front of the car, and why front brakes usually wear faster. In your case I might suspect dragging brakes possibly caused by a sticking emergency brake cable. In most cases these cables are only connected to the rear brakes hence the accelerated wear.

i would guess that either the emergency brakes are stuck on or the rear calipers should be inspected and or replaced.

Or, it might just be, if you have front drum brakes, that the rear brakes are adjusted closer then the fronts were. If the front drum brakes were way out of adjustments (farther away from the drum) then the rears would contact first and then the fronts. You should always check/adjust drum brakes once or twice a year.

I have not seen front drum brakes since the late sixties. The accepted course of action is normally every two changes of brake pads in the front a change of shoes in the back if complete inspection warrants this action. the only way brake shoes wear quickly in the rear is if the brake cylinders are jammed open then promoting the shoes to always be in contact with the drums or the emergency brake is sticking on when you release it. Have an inspection and correct your problem and save your money in the long run.

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Q: Why Your back brakes need change before your front brakes?
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