M Sport Brakes?
My current G20 is ok so far, but my F32 435d used to do the same...
caused generally by dust build up and a vibration at just the right frequency between the disk and pad that creates a high pitch squeal...
I used to find they were ok after a clean or giving them a good hard hammering on the brakes (In a safe location obvs)
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J
330i M Sport Plus
Previous- 435D M Sport
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