Why are my rotors rusty....

"gmctavish needs more space" (gmctavish) 12/24/2016 at 21:00 • Filed to: This seems maybe not normal

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My car was parked overnight, and in the morning, three of the rotors were covered with surface rust. Only my front right wasn’t all rusty, but still had the beginnings of some. Didn’t really photograph well though.

I’ve never seen them do this before, I’m confused.

for Michigan > gmctavish needs more space 12/24/2016 at 21:03

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The rotors on my Mazda did this for a while. Eventually they just didn’t do it anymore.

LongbowMkII > gmctavish needs more space 12/24/2016 at 21:03

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Rain/fog/dew?

TheTurbochargedSquirrel > gmctavish needs more space 12/24/2016 at 21:03

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They are bare metal. When they get wet they rust, use them a bit and it will go away.

E92M3 > gmctavish needs more space 12/24/2016 at 21:03

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High humidity? Mine does that if it rained overnight, or if the sprinkler hits it. Doubt you’re using a sprinkler in Dec though.

The Crazy Kanuck; RIP Oppositelock > gmctavish needs more space 12/24/2016 at 21:07

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You posted the reason why yesterday.

http://oppositelock.kinja.com/dashing-through-the-snow-1790450784

jimz > gmctavish needs more space 12/24/2016 at 21:08

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Brake rotors are plain cast iron; if they sit while it’s damp or rainy they’ll quickly develop surface rust.

gmctavish needs more space > The Crazy Kanuck; RIP Oppositelock 12/24/2016 at 21:11

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That wasn’t in this car though, that was the work Yaris. I just haven’t seen them start rusting so quickly

gmctavish needs more space > E92M3 12/24/2016 at 21:11

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High humidity yeah, I don’t usually see it happen this fast, but I’m also not usually parked directly beside the ocean

gmctavish needs more space > jimz 12/24/2016 at 21:12

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I’ve realized that I’m parked right beside the ocean, so this is now less confusing....still, none of the other cars beside me had surface rust on theirs

gmctavish needs more space > LongbowMkII 12/24/2016 at 21:12

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Right beside the ocean. But the other cars beside me didn’t have any surface rust

gmctavish needs more space > TheTurbochargedSquirrel 12/24/2016 at 21:13

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I know, I’m just not used to it happening so quickly. Being right beside the ocean probably explains it

4kc > gmctavish needs more space 12/24/2016 at 21:20

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metallic vs ceramic pads, maybe?

TheTurbochargedSquirrel > gmctavish needs more space 12/24/2016 at 21:20

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The salt from the ocean would accelerate the effect

gmctavish needs more space > 4kc 12/24/2016 at 21:21

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Maybe? I don’t know enough about brakes to say

gmctavish needs more space > TheTurbochargedSquirrel 12/24/2016 at 21:21

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The lack of rust on all the other cars beside me still confuses me though

JQJ213- Now With An Extra Cylinder! > E92M3 12/24/2016 at 21:39

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We are!

Fucking 85 degrees tomorrow

#FuckFlorida

(Sorry for the salty language. Florida is slowly killing me)

Wacko > gmctavish needs more space 12/24/2016 at 21:44

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Humidity by itself is enough to do that. I live very far away from the ocean and it does it all the time.

gmctavish needs more space > Wacko 12/24/2016 at 21:49

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Mine will if I leave it for a day or two, I just haven’t seen it do it overnight

Manwich - now Keto-Friendly > gmctavish needs more space 12/24/2016 at 21:49

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Because... Aliens!!!

LongbowMkII > gmctavish needs more space 12/24/2016 at 21:54

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Different pads and rotor materials

Wacko > gmctavish needs more space 12/24/2016 at 21:56

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I live In a swampy area, and everything is wet cause of the dew every morning.

gmctavish needs more space > Manwich - now Keto-Friendly 12/24/2016 at 22:03

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415s30 W123TSXWaggoIIIIIIo ( •_•))°) > gmctavish needs more space 12/24/2016 at 22:15

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I know the CRV will get like that if I leave it for a couple days.

If only EssExTee could be so grossly incandescent > gmctavish needs more space 12/24/2016 at 22:18

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Why? Because conditions were optimal for rapid rust formation, duh!

Wrong Wheel Drive (41%) > gmctavish needs more space 12/24/2016 at 22:20

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You should coat them with a nice rust resistant substance, like gasoline and then drive around the block and do some braking. Surely the rust will go away!

gmctavish needs more space > Wrong Wheel Drive (41%) 12/24/2016 at 22:25

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Flawless plan!

MarchUntoTorment > gmctavish needs more space 12/24/2016 at 22:31

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Happens very often to mine. A short drive clears it up.

E92M3 > JQJ213- Now With An Extra Cylinder! 12/24/2016 at 22:42

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It’ll be 71 here tomorrow. Not complaining one bit!

1111111111111111111111 > gmctavish needs more space 12/24/2016 at 23:15

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My Miata will do this every night when I’m in the rain. Even in the garage. The car is a 99, and original rotors. They get shiny again when you drive. No problem whatsoever.

Tazio, Count Fouroff > gmctavish needs more space 12/25/2016 at 04:38

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This happens kinda often on mine when I happen to look at them. If parked overnight or for a day or two — especially if parked outdoors — when it’s a little bit humid; which given the southeastern USA is, like, nearly always, they get a fine, thin orange surface coating. One good application of braking and it’s gone immediately tho