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Hi All,

Recently purchased my 2017 Cayman S and noticed rust appearing on the brake drums and wondering if others are getting this and also what anyone has done to rectify/prevent this, attached a photo from the wheel worst affected.

Any help appreciated!
 

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This can happen when it is damp out....You can use a rust treatment on just the rusty areas, just don't get any on the brake shoes!
 

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<Pedant mode on> Those are disks, drums went out years ago! <Pedant mode off>😆

The rust is normal, and is generally not an issue--a quick drive will wipe it off. The disks are cast iron because stainless steel disks don't work very well when wet.

The only way to keep them from rusting is to coat them with oil or another rust proofer--great for driveway display, but then the brakes won't work at all so the car is undriveable. 😢
 

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After you wash the car, apply Hyde’s Serum Rustopper to prevent flash rusting on the brake disks. It doesn’t hamper braking. Rust on the hub is harder to prevent, but you can hit it with a wheel cleaner that has an anti-ferrous component. I like Bilt Hamber Auto Wheel, which is a UK product, so should be easy to find there. With parking in damp conditions, it’s harder to prevent.
 

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If you look at his picture closely, the rusted area is not the area in contact with the pads. This is the area that can be treated with rust preventer without affecting brake performance. I have used Por-15 high temp silver on this area and it keeps the rust away nicely!
 

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I think the rust converter/inhibitor on the rotor hubs is a good idea.

If you are really fussy you could also pain them or purchase 2 piece rotors with alloy hats/hubs.

IMO Porsche is a bit cheap the way it uses single piece rotors on these cars including 911s. Even Audi and BMW are putting 2 piece rotors on their sports models as standard for at least past 20 years.
 

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Discussion Starter #7
Thanks for all the replies guys, appreciate it and glad someone pointed out to Greg it wasn't the actual discs i was asking about.

Like you i am surprised that Porsche have not remedied this. I'll look at some of the rust preventative sprays you can get
 

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Sprays are not the best. You don't want it getting on other areas such as the wheel to rotor surface. Por-15 is easy to brush just where you want it. I also brush it on the perimeter 1/2" edge of the rotor to keep it nice.
 

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Thanks for all the replies guys, appreciate it and glad someone pointed out to Greg it wasn't the actual discs i was asking about.

Like you i am surprised that Porsche have not remedied this. I'll look at some of the rust preventative sprays you can get
Bilt hammer.... Atom Mac can be sprayed over any porous metal surface .. disc/ rotors and has a anti rust agent in it ... it is not a oil... so braking is not affected... great to put in before washing the rotors / discs, and then the applying it after , been using it for the past 6 months..
 

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This is so common, both Audi TT’s I had and this CS 718 the rotor hubs are atrociously rusted. It’s incredible that a marque like Porsche design can even allow this visual disfigurement to happen, it’s quite basic really!
I cannot imagine there are any with non rusty hubs . . .
I’m just about to address my own rusted hubs, Prep then zinc galvanised spray should do it well, than I think I’ll try the Bilt Hamber rust preventer as someone mentioned.
 

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This is so common, both Audi TT’s I had and this CS 718 the rotor hubs are atrociously rusted. It’s incredible that a marque like Porsche design can even allow this visual disfigurement to happen, it’s quite basic really!
I cannot imagine there are any with non rusty hubs . . .
I’m just about to address my own rusted hubs, Prep then zinc galvanised spray should do it well, than I think I’ll try the Bilt Hamber rust preventer as someone mentioned.
Porsche have addressed this.
I purchased mine withthe PCCB option and have no issues with rust. The rotors are 2 piece with aluminum hubs.

My previous car, an Audi TT the brake rust was so bad that the pads would routinely stick to the rotors overnight in precipitous conditions.

I paid a pretty penny sure, but got some yellow calipers to flaunt through my neighborhood.
 

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OP that's not a brake drum. The part you are seeing rust appear on is called a rotor hat. Odd yours are showing some rust. Maybe they're not OEM and were replaced with a lesser brand by the prior owner.
 
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