BMW Repair Questions? Ask a Mechanic for Answers ASAP
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you could have caught some debris up in the brakes which is a common cause of noise, also the brake pads could have been shifted slightly which would also cause noise,
I would advise that you go to a main dealer or BMW specialist for a check. The sooner the better, the longer you drive the more chance you will do further damage to the rotors and pads, or possibly calipers
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as long as it stops predictably, then yes you can drive it.