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This really is defect by BMW and I'm really surprised so many of you have this problems. My car was in for a leak test for a week and we I got it back my disk hubs had several large rust spots on the hubs. There is plenty of solution on the market to correct this issue but it should be fixed by BMW.
The problem here is the brake pad dust + steel + water = a volatile soap for corrosion and not so much road salt. Best to hose the brake dust off the hubs when you can.
At least I’m going to make the dealer replace the hubs.
Orb
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