Welcome to the club......my m5 has been driving crazy and yet dealer couldn't find a resolution. I have service department telling me it's completely normal for high performance brake made by Brembo. My 911 didn't have that and the brake was Brembo made, so I don't buy that BS excuse. Good thing that I am parting away with the M5 soon enough that I just ignore the annoy noise every single time I touch the god damn brake.
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Must stop eating..............
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