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Hi Ching,
I switched mine from 18" to 20" m5 oem wheels, same thing happening to me, I went to BMW for them to check and they told me nothing to do with the brakes and it must be my second hand wheels got scratched so it makes sounds...(seems like they just doesn't want to work on it since I switched the wheels) then I brought it to a wheel shop and ask about the sound they told me it has something to do with the loading on the stock brakes. when we switch to bigger wheels, the original brakes couldn't handle it and therefore create the sound that we hear.
Any Ching out there ever heard about this explanation? Because I might get a BBK for this reason/excuse......and I really wanna fix this sound...
Thank you
Chings
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