Thread: Wheel rust
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      12-25-2019, 01:34 PM   #2
claykin
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Drives: various BMW
Join Date: Nov 2009
Location: Florida

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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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