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I had brake vibration when I first picked the Z4M. This was a new car right off the showroom. I took it back the deal said the car had sat so long that there was rust and crap the they had to clean all the rotors.
I have many track days on the car with carbon tech back. Hard enough brakes to make the rotors glow bright red in some braking zones. The warping and the brakes now have almost 10K miles.
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