Rusty Disk Brake Rotors

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Rickles

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#323373 25-Nov-2025 09:34

Has anyone used a successful spray-on rust preventative?

Yes, regular driving and braking should keep the rotors clean, but with our weather and using the vehicle intermittently the rotors do attract rust/corrosion pretty quickly.

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MikeB4
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#3437354 25-Nov-2025 09:54

Tip: don't oil them😀

seriously though you should get them checked for pitting and they may need a light rotor grind. Normal light surface rust will come off in normal driving

Here is a crazy notion, lets give peace a chance.

mudguard

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#3437359 25-Nov-2025 10:15

I'd honestly just leave them. Rotors are cheap in the grand scheme of things and they will need to get seriously rusted for some time before they're a safety issue.

Can you park it somewhere dry? That will help.

Senecio

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#3437361 25-Nov-2025 10:21

How infrequently are you driving it? If its more than once a fortnight I wouldn't bother. Just dab the brakes a couple of times when you first drive off to scrub the rotors clean before your first real braking.

richms

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#3437363 25-Nov-2025 10:26

I have found that if something is parked still and not used and they rust, there is no rust behind the caliper and then when it is used it becomes very pulsey when braking.

Richard rich.ms

Rickles

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#3437367 25-Nov-2025 10:42

Thanks for replies.

I too found the pulsating/clonking braking after being overseas for a month, but normal driving did abate that after a week or so. I've not got a garage.

My last vehicle was a Jeep Cherokee, so being heavier using the brakes was more often than my new lighter car. Als, being hybrid with regenerative braking system, it tends to slow a lot when lifting off accelerator, meaning less braking pressure/time.

Of course a more expense Porsche, Lambo etc with ceramic brake rotors might help, but .... 😁

Several people seem to use an anti-rust spray to good effect when necessary. I also note that newer replacement rotors now have an anti-rust protection when manufactured.

richms

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#3437369 25-Nov-2025 10:51

Rickles:

Several people seem to use an anti-rust spray to good effect when necessary.

The thing I would be concerned about is anything you put on it removing the brake pad material that has transferred over effectively undoing the bedding in of the pads making it really bad for a while till that happens again.

Rickles:

I also note that newer replacement rotors now have an anti-rust protection when manufactured.

That is generally removed when you install it with a solvent called "brake cleaner" which gets rid of all the oils and grease really quickly.

Richard rich.ms

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Rickles

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#3437371 25-Nov-2025 11:18

There are a number of services offering replacement rotors with anti-rust coatings - e.g.

Power Stop Evolution: Features genuine Geomet coating that covers the entire rotor to fight rust and corrosion effectively.
DBA Street Series En-Shield: These rotors use a special "En-Shield" coating (often referred to as a "Gun Metal" finish in the latest transition) that increases surface rust resistance on non-braking areas.
EBC Premium Rotors (Gen 3): EBC is transitioning its entire range to a new "silver grey" highly corrosion-resistant coating for maximum rust prevention.
Raybestos Element3 Coated Rotors: These use an advanced "Grey Fusion 4.0" coating that is molecularly bonded to the rotor surface and designed to withstand severe environmental exposure.

gzt

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#3437430 25-Nov-2025 12:56

I have a car with recently skimmed rotors and new pads and that doesn't seem to be a practical problem by the time I've driven a couple of kms.

I have another vehicle that needs rotors doing and it is very much a thing for that vehicle.

Ime mechanics these days will tend to say it's not worth it until the next pad change is due, or not worth it until the disc is well out of spec. Ie; don't spend the money until you have to.

In practice it makes a huge difference and makes the car much nicer to drive and no doubt safer.

That's my 2c subject to inspection it's likely the overall condition of your rotors need a look.

Linux

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#3437436 25-Nov-2025 13:51

It will be lite surface rust don't throw your $$ away that is nuts - 1 minute drive down the road and it will be gone

RunningMan

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#3437447 25-Nov-2025 14:46

Different pad compounds can change the rust buildup, as some of that rust is residual pad material on the rotor.

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#3437448 25-Nov-2025 14:55

RunningMan:

Different pad compounds can change the rust buildup, as some of that rust is residual pad material on the rotor.

150% correct the OP must have money to burn!

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Senecio

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#3437495 25-Nov-2025 16:40

Rickles:

There are a number of services offering replacement rotors with anti-rust coatings - e.g.

Power Stop Evolution: Features genuine Geomet coating that covers the entire rotor to fight rust and corrosion effectively.
DBA Street Series En-Shield: These rotors use a special "En-Shield" coating (often referred to as a "Gun Metal" finish in the latest transition) that increases surface rust resistance on non-braking areas.
EBC Premium Rotors (Gen 3): EBC is transitioning its entire range to a new "silver grey" highly corrosion-resistant coating for maximum rust prevention.
Raybestos Element3 Coated Rotors: These use an advanced "Grey Fusion 4.0" coating that is molecularly bonded to the rotor surface and designed to withstand severe environmental exposure.

The coatings that you are refering to above are designed to prevent rust on the non-braking areas. The actual contact area will be free of any such coating. As another poster has mentioned, rotors shipped with a thin layer of oil to prevent rust in storage but it needs to be removed before instalation with brake cleaner. The contact area will rust with limited use and there's really nothing you can do to prevent it.