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      05-31-2011, 12:32 AM   #128
jjjheimer
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Drives: 2009 E90 M3 M-DCT
Join Date: Nov 2010
Location: Edmonton, AB

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I heard the exact sound in the video above when reversing and my solution was to flick the metal dust shields behind each of the brake rotors. While I did not notice pebbles/rock falling out of the dust shield the cowbell sound was gone after that and hasn't come back.