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M2 Technical Topics > Wheels / Tires -- Sponsored by The Tire Rack > Removed rear wheels and saw this. Anyone have this as an issue?

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      01-05-2020, 09:19 PM   #1
SilverScotty
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Removed rear wheels and saw this. Anyone have this as an issue?

So I noticed that my rear wheels had a lot of rust looking buildup on the inner hub after the last washing. Decided to finally ceramic coat the wheels. When I pulled off the rears, there was quite a bit of rust as I suspected. Looking at the hub on both sides I saw this. The fronts did not look like this. Looking for insight into why the centering hub(?) is rusting so badly on the rears only. I live in So Cal and while we've had a bit of rain lately, it certainly hasn't been flooding or anything.

Car has 3k miles on it.
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Last edited by SilverScotty; 01-05-2020 at 09:21 PM.. Reason: Updating mileage.
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      01-05-2020, 09:47 PM   #2
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That's a common issue. Get a wire brush drill kit and use the attachments with a power drill to quickly knock off the rust. Afterwards wipe down everything and apply anti-seize to the hub. That'll keep it from further rusting.
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      01-05-2020, 10:24 PM   #3
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The dealer classified this as normal..

Rust Treatment works for me, just don't get it on the surface area of the rotor.
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      01-06-2020, 07:00 AM   #4
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Everyone with these brakes has it. I wire wheeled mine then sprayed with whatever rust inhibiting spray paint was in the garage. I really want to take the rotors off and do it properly but haven't found the motivation yet
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      01-06-2020, 08:43 AM   #5
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Are there two screws holding the rotors on?
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      01-06-2020, 09:06 AM   #6
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I noticed that too on mine. The dealer said not to worry about it as it was a common thing. I didn't believe them, but I didn't think I could do much to prevent it.
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      01-06-2020, 10:36 AM   #7
aerokubectl
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I saw this and I live in CA.
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      01-06-2020, 10:38 AM   #8
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normal
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      01-06-2020, 10:48 AM   #9
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Quote:
Originally Posted by f31mtl View Post
Are there two screws holding the rotors on?
The 5 lugs and the wheel hold the rotors on. The allen bolts just hold them in place when the wheels aren't on.
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      01-06-2020, 12:01 PM   #10
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I usually just put a thin coat of anti-seize on the hub spigot and it does a decent enough job preventing heavy accumulation of rust.
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      01-06-2020, 02:50 PM   #11
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Thanks for the responses. Looks like a wire brush and likely some anti-seize are in my near future.
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      01-16-2020, 03:05 PM   #12
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Picked up some wire brushes and went to town on the hub. Then coated them in anti-seize. Couldn't really get in the corners that well so I guess we'll see how they hold up now. Tired of rusty water smears on the inside barrels of my wheels right after I wash it.
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