Thread: Noise In Rear
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      03-03-2013, 08:38 PM   #6
llis
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2013 BMW M3 ZCP  [5.00]
2003 BMW M5  [0.00]
From the description this seems to be the infamous cowbell, which usually is a rock caught in between the brake disc and the backing plate. (Search "cowbell" and you'll find lots of threads on m3post.) Tap on the plate and see if it has the same note. Sometimes some hard braking can free it, or you can try with your fingers. If it's not the same note, well, just ignore my comment.
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2013 E92 ///M3 ZCP 6MT Speed Yellow 2003 E39 ///M5