Quote:
Originally Posted by claykin
What you're showing is a pic of the brake rotor and the "hat" that covers the wheel hub. This is BMW's one piece rotor design.
Given the type of material BMW commonly uses, a little surface rust here is not unusual. Often acidic wheel cleaners will contribute to this problem so I highly recommend a pH neutral wheel cleaner and take extra time to rinse brake parts well after washing wheels.
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Thanks for the reply! Yes, it seems like my cleaner is acidic and probably made this worse.
Do you think I could use light sandpaper to sand the rust off, then perhaps seal the surface with something like Crystal Serum or some other ceramic coating?