I could be misunderstanding the noise you're describing, but a lot of high performance brakes will make a lot of different noises when coming to a stop and I've always thought it to be pretty normal. For instance a friend of mine drives a c6 z51 Corvette (off topic: LG coilovers and long tube headers on his car are supreme. Haha) and his brakes have always made a sort of slight vibration accompanied with what sounds like the pads slipping across the rotors when it's coming to a stop.
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-Michael
Active Autowerke Stage II | MMW CSv2 Exhaust | MMW Catless Headers | BC Racing BR Extreme Low Coilovers | custom adjustable rear suspension links | 19" Hyperblack CSL's | M3 style front | trim wrapped in brushed steel vinyl | Slightly smoked tail lights with clear reverse lights | factory xenons
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