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Old 11-09-2012, 05:15 AM   #3
lucky_doggg7
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Join Date: Mar 2008
Location: OC
Posts: 282
My Ride: 2005 M3
Dude - that is a small rock stuck between the rotor and the dust shield that is located on the backside of the rotor, or it is the rotor rubbing against aforementioned dust shield. I had this same noise after haphazardly cutting (and I must have inadvertently bent the dust shield) so that it rubbed against the rotor when I installed my Brembo rear bbk. Remove the rear wheel, get a long screwdriver and insert it between the rotor and dust shield, then perform a prying motion all around the rotor's perimeter to move the dust shield away from the rotor.
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