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Old 04-18-2002, 01:44 PM   #1
aphex twin
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Default rust on rotors

i just noticed my rotors are starting to rust. obviously not where the brake pads make contact, but on the inner part where it comes out for the rims to sit on. is it safe to use a brillo pad or some fine sandpaper to sand it off and primer it? or do i have to use a special paint? TIA
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Old 04-18-2002, 02:22 PM   #2
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Default Re: rust on rotors

Quote:
Originally posted by aphex twin
i just noticed my rotors are starting to rust. obviously not where the brake pads make contact, but on the inner part where it comes out for the rims to sit on. is it safe to use a brillo pad or some fine sandpaper to sand it off and primer it? or do i have to use a special paint? TIA
I think rust occurs on every car that I have known of, including my in-laws' Mercedes S500, my Acura 3.2TL etc. It is not something that we need to be worried about, I would suppose ?

Later...AH
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Old 04-18-2002, 02:24 PM   #3
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Yeah, look at your rotors after a good rain. They will be rusty. It all gets scraped/burned off as you drive.
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Old 04-18-2002, 02:58 PM   #4
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Default Re: rust on rotors

Quote:
Originally posted by aphex twin
i just noticed my rotors are starting to rust. obviously not where the brake pads make contact, but on the inner part where it comes out for the rims to sit on. is it safe to use a brillo pad or some fine sandpaper to sand it off and primer it? or do i have to use a special paint? TIA
Are you talking about the rotor hat?
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Old 04-18-2002, 03:13 PM   #5
aphex twin
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the rust is NOT where the brake pads leave the wear mark. its the inner portion where the studs for the rims stick out. that is the area where it rusted. its so very visible with the wheel on. if i find a pick of a rotor, ill show you what i mean
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Old 04-18-2002, 03:31 PM   #6
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Quote:
Originally posted by aphex twin
the rust is NOT where the brake pads leave the wear mark. its the inner portion where the studs for the rims stick out. that is the area where it rusted. its so very visible with the wheel on. if i find a pick of a rotor, ill show you what i mean
Yeah it's the hat.

This can be OK if it's just light surface rust. If it's flaking you have an issue.

The surface that contacts the wheel is basically protected from the outside world so it will rust very slowly. In that area the coating gets abused by just mounting the wheel. Then a bit of water gets in there and you get a light surface rust.

Piics would be helpful.
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Old 04-18-2002, 08:08 PM   #7
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i have the same thing, i believe they are surface rust, sort of like the one on the rotor surface but since these are on the hat, they don't rub off

i went to home depot and got myself a can of grey primer, took the wheels off, wax the rims while i had them off i might add, and spray the hat with 2 coat of grey primer, use a card board to block off the excessive over spray on to the rotor, a little bit on the rotor is fine

so far it's holding up quite well and the rust haven't shown thru
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Old 04-18-2002, 11:43 PM   #8
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Cadium plated rotors- 8 months with ZERO rust.
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Old 04-19-2002, 05:07 AM   #9
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Rotors are made of iron. They are untreated/uncoated usually. If it rains or water gets on them, they will rust. No problem.


-Jason
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Old 04-19-2002, 09:31 AM   #10
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Heck even rust on the braking surface can be good. I noticed the SHO braked MUCH better after it sat around long enough to pick up a fair ammount of rust on the braking surface. I guess it broke up the smooth rotor and pad surfaces for a little more grip.
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Old 04-19-2002, 10:09 AM   #11
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Quote:
Originally posted by Crzykdd
Rotors are made of iron. They are untreated/uncoated usually. If it rains or water gets on them, they will rust. No problem.


-Jason
The hats are always coated. The problem is the EPA makes it almost impossible to use a good coating that is low cost. All the EPA safe stuff that works is very expensive.

So, the OEMs just use whatever crap that fits the budget but is EPA safe.

Last edited by romanom; 04-19-2002 at 10:37 AM.
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Old 04-19-2002, 10:34 AM   #12
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Quote:
Originally posted by XT6Wagon
Heck even rust on the braking surface can be good. I noticed the SHO braked MUCH better after it sat around long enough to pick up a fair ammount of rust on the braking surface. I guess it broke up the smooth rotor and pad surfaces for a little more grip.
Hmmm...I had the reverse effect with the WRX, after it had sat around a while. The braking improved after the rust wore off.

Later...AH
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Old 04-19-2002, 11:00 AM   #13
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Ya, it wasn't great till the surface rust got scrped off, but It had sat around long enough for a little bit of minor pitting on the surface.
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Old 05-17-2004, 12:03 AM   #14
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Quote:
Originally posted by HIHO
Cadium plated rotors- 8 months with ZERO rust.
do you think that zinc plated would have the same protection?
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Old 01-24-2008, 10:02 PM   #15
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Bump for old thread. Is it ok if the rotors have rust flaking off on the INSIDE of the rotors, ie where the vanes are?
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Old 11-16-2008, 09:21 PM   #16
Krang
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what if I want to make this rust go away... forever.
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Old 11-16-2008, 10:06 PM   #17
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Quote:
Originally Posted by romanom View Post
The hats are always coated.
no, they aren't. On nicer rotors, they are either painted or have a sacrificial coating of some sort on them, but the cheapies are not (nor do they need to be - the rust is purely a cosmetic issue - has effectively no impact on performance)
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Old 11-16-2008, 11:03 PM   #18
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Its almost impossible to avoid. I had a set of Brembos on a previous car. The hat rusted on them too. About the only way to avoid it is to get a rotor that's been coated (zinc or otherwise).

But its just cosmetic. If its already rusty, you're just going to have to live with it. Or buy new rotors.
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