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The DSC uses the rear brakes to slow down a wheel that is spinning too fast due to lack of traction, sort of like a limited slip differential. That can cause the rear brakes to wear faster than the front ones.

Brakes also wear due to drag, even when the brakes aren't applies. Maybe something's dragging back there, ever so slightly.

My 2015 535i shows that the rear brakes are wearing about 80% as fast as the front ones. That's high. With Frau Putzer's 2006 Accord, the back brakes wore just as fast as the front. The rears started squealing at 145k miles. The fronts were just about to at 147k miles when I replaced them before selling the car to a friend.
 
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