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You'll be fine. Think of those that do standing burnouts and our cars don't have line locks - the rear pads are continuously making contact, as you feather the brakes to let the front pads grab so you're standing still while letting the rears smoke. The car still runs fine after. Your wife just skimmed the top of the pads and rotors of the rears.
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 '04 E46, '08 E93, '16 F22 M235i, '17 i01 i3 |