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Old 11-14-2012, 08:34 PM   #10
dilburt
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Join Date: Jul 2012
Location: Seattle, WA
Posts: 1
My Ride: 2004 M3
Rear brake rotor shield

If I recall correctly, there was a service bulletin regarding e46 rear rotor shields around that model year. It was related to heat causing the shields to warp and contact the rotor which made a grinding noise like this. I believe they issued a replacement shield part that solved the problem.

D
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