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Have a '22 540i with the m-sport brakes, even same color as yours. At around 2k miles the squealing began. Left it at the dealership for a few days, and they said there is nothing they can do. Happened a little more after that. Then the car sat for most of the winter, and I have heard nothing since. Now have about 6500 miles on it and the brakes are quiet. Nothing else has changed. Basically got the same story from the dealer - nothing you can do about squealing brakes with the m-sport brake option.
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