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Originally Posted by Skyline2.0
Any braking issues? Weird noises? Vibration in pedal? Pulling left to right? Scoring in the rotor face? If all seems normal, I wouldn't worry about it too much. Definitely monitor for any changes in driving, handling and performance.
It looks like buildup of surface rust and brake dust that gets scrubbed off rotors after a rainstorm or car wash. I know BMWs are known to produce more brake dust than other cars.
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My car is new, will BMW replace this in warranty?