what is this crap on my rotors? - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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#1 (permalink) Old 06-21-2004, 01:58 PM
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got a 95 325i. when i saw my car this morning, it has all this yellow/orange crap on each rotor...
it seemed to of just happened overnight w/o me even driving it.

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#2 (permalink) Old 06-21-2004, 01:58 PM
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mole is an unknown quantity at this point
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two.
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#3 (permalink) Old 06-21-2004, 01:59 PM
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three.
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#4 (permalink) Old 06-21-2004, 02:05 PM
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that would be rust... its normal

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#5 (permalink) Old 06-21-2004, 02:06 PM
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mole is an unknown quantity at this point
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from overnight?
so can i just scratch it off?
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#6 (permalink) Old 06-21-2004, 02:16 PM
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As soon as you pull out of your driveway it will gone. Completely normal.

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#7 (permalink) Old 06-21-2004, 02:21 PM
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mole is an unknown quantity at this point
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year, your right. it's all off now.

i freak everytime i see something odd about my car.
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#8 (permalink) Old 06-21-2004, 02:47 PM
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It does seem odd for that to occur overnight.

If I leave my car for about 2 weeks without driving, I get rust forming on the rotors. But NEVER over a single night.

Mind you, I suppose location has a huge part in all of this. i.e. humidity, air temp, overnight temp, etc. etc.

It's fairly dry where I live.

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#9 (permalink) Old 06-21-2004, 02:57 PM
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I had noted rust on my rotors when I left work about an hour ago.

We had some wicked storms though; our building even started to flood.

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#10 (permalink) Old 06-21-2004, 03:04 PM
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that usually happens on anyones rotors when it rains. It can even happen if dew settles overnight, perhaps with a vast change of temperatures-same kind of thing when you see dew/water on your windshield when you wake up for school or work in the morning. A lot of it could even be just rusting of settled brake dust. All very normal.

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#11 (permalink) Old 06-21-2004, 03:08 PM
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it is a very tiny layer of rust. as soon as you apply the brakes it rubs off.

completely normal on all cars.

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#12 (permalink) Old 06-21-2004, 03:41 PM
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Hey mole, that are not the original rotors! Maybe that's why they rust in one single night!!?

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#13 (permalink) Old 06-21-2004, 04:04 PM
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rain will do it over night, but High Humidity for more than 6 hours will do it too. If the relative humidity is inthe 70% or higher, you will probably see it 10 to 12 hours latter, especially if there was already a little bit of rust present.
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#14 (permalink) Old 06-21-2004, 04:39 PM
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It's called "flash rust" and will happen on all rotors even from just washing your car.

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#15 (permalink) Old 06-21-2004, 04:58 PM
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Quote:
Originally posted by RIBEMR26@Jun 21 2004, 05:19 PM
It's called "flash rust" and will happen on all rotors even from just washing your car.
This is true, I get rust on my rotors about half an hour after washing my car, a nice thin coat of orange.

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