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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Rust proof brake discs for '07 328xi (E92)?



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      08-05-2009, 01:00 PM   #1
davis328xi
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Rust proof brake discs for '07 328xi (E92)?

Hi,
I have an '07 328xi 2D coupe, and am getting a bit frustrated with reoccurring topical rust on my brake discs. It's mostly on the rear wheels, but am noticing it some on the front as well. I've had the detailers wire brush it off before, but that's just a temporary fix, and would like to replace all four brake discs with a rustproof material if possible.
Does anyone know what the brake disc size is I should be looking for (have stock 17" rims)? What material should I look into (stainless steel?)? And also are there any websites you'd recommend? I know I'll need my (st)ealership to install them, but would like to buy them cheaper online if possible.

Thanks for all your help!

LT
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      08-05-2009, 02:49 PM   #2
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I do know Tirerack.com offers rotors that have have specially been chemically treated or powder coated so that the hubs do not rust. You may want to take a look at them first.

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      08-05-2009, 05:24 PM   #3
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are you talking about the hubs themselves? not the actual disc right?

If so you have two options-
1. Paint them with cermaic based engine paint... I did this myself, and we will see how it holds up.
2. apply a thin coating of never seez on the hub. its gery in color and will prevent rust.
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      08-05-2009, 08:12 PM   #4
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brake disks (rotors) are steel, so they are going to naturally rust unless you coat them. you can try painting just the hat part of the brake disk with a hi-temp silver paint (like the kind for exhaust headers).

I know people that did that and it stopped the hat part of the rotors from rusting. Just don't go crazy and paint the whole thing haha.
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      08-05-2009, 08:41 PM   #5
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I think the only brakes systems out there that wouldn't rust would be the carbon brakes, like on the new Porches. But that is like $15,000 option!
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      08-05-2009, 10:05 PM   #6
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Zinc plating?
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      08-05-2009, 10:16 PM   #7
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Quote:
Originally Posted by GregL View Post
Zinc plating?
That would only be a temporary fix. The only way to not have any rust is to make the whole rotor of a material that won't rust. Any coating will eventually be rubbed off
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      08-06-2009, 02:32 AM   #8
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Lucky to be in Cali. The weather and regular washing keeps my '06 hats and related brake components looking like this after almost 61K.



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      08-06-2009, 02:32 AM   #9
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the brake discs are made of cast iron.

they are not made in stainless steel. wear and specific heat of steel is not good for brakes. the only option is ceramic, which is 15K+

your options are to paint the hub with high temp paint. if you're talking about the disc surface, where the pads contact the disc, there is nothing that can be done about that.
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      08-06-2009, 11:37 PM   #10
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I would say to prevent it in the future, do not use any harsh wheel cleaners, as they have a tendency to remove coatings on calipers and rotor hats. My car had Rotora BBKs with ceramic rotors for a while while it was on the car show circuit, and now for street driving it has steel rotors with the aluminum hub. I don't use wheel cleaners at all, and I have no deterioration of the finish on them at all. Now, the disc itself will get a little orange after washing the car if it sits, but it quickly rubs off with a brake application. If that is what you are trying to prevent, then good luck with that while you have steel rotors.

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      08-09-2009, 03:52 AM   #11
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I did a write up on this topic in my AluFelgen CSL wheel review. It's probably buried, but like everyone is saying, just clean and green scotch brite pad the hat part and paint with high temp engine or header paint. I used a "cast iron" colored 500 degree header paint that just looks awesome!
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