Interesting. I didn't know Girodiscs would rust like this. Most high-end rotors come with a rust-proof coating to prevent rust everywhere (except where there is pad contact.) I'm pretty sure the stock OEM rotors have this rust-resistant coating.

Here's a quick google search result on rotor coatings:

Coated vs. Uncoated brake rotors: Is rust preventive coating worth it?

The uncoated cast rotor has a bare unprotected exterior which is prone to corrosion. In turn, the premium coated rotor has a special barrier layer along its entire exterior surface to protect the rotor from corrosion and to keep it clean. But is this coating really effective and worth the extra...

www.allrotors.com

 

Wow. I have been looking into these rotors as well.

 

Girodiscs are coated well. Time and heat causes small exposed areas of rust on rotors that are not "cleaned" by the pads. Floating rotors will have this small ring of surface rust you are noting. The OEM R8 coated rotors rust the same except the pad interfaces the entire exposed face since it is not floating. OEM is rigidly mounted to the "hat". You see the outer and inner rotor rust below.

 

yup, iron rusts, not a functional problem
CCB rotors don't

 

I wouldn't let it bother me. The improvement in functionality is worth the patina.

 

You could always paint them with some vht paint. It would be a bit of a faff with them in place, but if you decided to remove them to do it, ensure you change the bolts that the bells attach to the disc with.

 

Iron rusts.... I don't see the problem.

 

Normal iron disc behavior and not a cause for worry. The only way to avoid it is ceramics.

 

I know iron rusts but I’m saying it just looks bad since there is that one area that never gets touched by the brake pads. Also rust slings all over the inside of the wheel.

 

You have this rust "slinging" all over the inside of your wheel? We do not see this behavior after over 10,000 miles including a number of runs at the track with track pads.

 

yea hard to believe but you can take a look here with your own eyes and see for yourself. Not sure how the rust slings off the rotor, maybe when it’s being scraped by the brake pad there’s enough moisture that it creates some kind of slurry that ends up all over the wheel in this sort of pattern. Either way, never really had this problem before. I’ve driven over 88k miles in this R8 and it lives its life outside never really garaged.

 

yea hard to believe but you can take a look here with your own eyes and see for yourself. Not sure how the rust slings off the rotor, maybe when it’s being scraped by the brake pad there’s enough moisture that it creates some kind of slurry that ends up all over the wheel in this sort of pattern. Either way, never really had this problem before. I’ve driven over 88k miles in this R8 and it lives its life outside never really garaged.

Yes, this I have not remotely seen, but ours is mostly garaged. Yes, I suspect this is surface rust on the face of the rotor being scraped off in the next few stops although likely in the rain/still wet based on the picture. And/or rust from the rotors edges and vanes perhaps due to being out in the environment so much. The small band of rust to the inside that you noted above does not seem like it would be the cause of this mess.

 

Agree I've never seen anything like this. My TT lives outside and doesn't get driven enough to keep the rotors from developing rust some, but I've not encountered anything like this.

 

Hello


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By by scammer.
Reported.

 

That looks like the rotors were Rusty from a car wash or sitting, and then started driving off in the wet.

 

Good to go!

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88k!!! You got me by about 30k but I'm shooting to catch you. I don't know much about this topic but when I look at your photo the whole interior stuff all seems to be quite rusted. Looks to me like a car thats done some hard time outdoors and not a problem with the disks.

 

Hi

Steel will rust and zinc spray on exposed surfaces will prevent rust.
This only works if the disc is new and clean before coating.


Tom

 

Hi

Steel will rust and zinc spray on exposed surfaces will prevent rust.
This only works if the disc is new and clean before coating.


Tom

too late for that now, I guess I’ll do it on my next set of rotors

 

The center hub is still rusty!

 

I was going to say zinc washed rotor option on my stoptech's on another car prevented the rust on non-swept areas of the rotor. Also, I think that rust being slung isn't from the pad surface, its the rusted areas in between the rotors swept surfaces, where the veins are. If the car sits out overnight, condensation and rust is forming in that area and getting slung off when you drive it next in the AM.

 

Appreciate them, could be worse, you could have CCB.

 

Just a reminder we do have our next gen carbon ceramic rotors as both an upgrade for the iron rotor setup (no rust!) and as a CCB replacement set. These are not your grandfather's carbon ceramic rotors, chopped carbon slapped in a mold, but continuous fiber reinforced ceramic with carbon molecules that organically align during the manufacturing process. Three times the hardness, three times the thermal conductivity. And they can be refurbished twice in their lifetime (affordably!).

They also handle elevated track temperatures with no problem and are now being used in a professional race series, three support classes. There are multiple brake pads available to fit your driving/braking style.

And they're LIGHT. Serious unsprung and rotating mass removal. Being a premium performance product, they're not inexpensive but are less so than the inferior OEM discs. Girodiscs are lead weights in comparison, especially if you "upgrade to the larger front diameter discs. They're around 40 pound each!







Here's the first iron rotor replacement set. They're upgraded to a 380x34mm disc and we supply spacers and bolts to move the caliper out radially. The rears are the same size on both sets (OEM sized).

 

And they're LIGHT. Serious unsprung and rotating mass removal. Being a premium performance product, they're not inexpensive but are less so than the inferior OEM discs. Girodiscs are lead weights in comparison, especially if you "upgrade to the larger front diameter discs. They're around 40 pound each!

LOL that's a 38% exaggeration there salesman regarding Girodisc upgraded rotor weight. The Girodisc 2-piece upgraded aluminum hat slotted rotors are 380 mm x 34 mm and weigh 25 pounds.

And I know you guys like to ignore pedal feel and threshold braking, but it matters...a lot.

Durability - the ceramic rotors, even ST's, do not like off road excursions, which is why the guys who run the track come to us for Girodiscs...along with pedal feel and threshold braking.

 

Those are awesome but also probably very expensive.

 

They absolutely are a premium product and a very, very high caliber, trick component. With that said, if you add up the costs of rotor replacement over the years, and assuming the R8 is driven regularly like yours is, you'll likely break even from a cost standpoint. You'll be far ahead in performance for all those miles though!

 

What are these off road excursions you talk about.

 

Leaving the track...missing a corner, brake fade (happens with stock rotors), etc. It happens for amateurs and pros.

 

We need r8 talk to weigh in on this fight and talk badly about both products then push his. I prefer a brawl over an2 person fight for my entertainment.

but seriously ape guy, sell your benefits and don’t knock another guy on here. It’s too tiring to have the back and forth and doesn’t come across well.

paleo, there are better deals on alibaba for rotors so your time selling them on here is limited. It’s catching on quickly what a great place alibaba is to get genuine oem parts and upgraded mods. It’s totally legit and less than half the price. A stripper even verified it once but them the mods lost a cut of commission so they deleted the evidence.

 

So it's ok for Scott to knock my product but not his? Get real. I never knocked anyone simply pointing out facts.

 

My takeaway here is when I replace my girodiscs I should spray them in zinc to prevent that ring of rust where the pads don’t wipe the rotor? Any specific zinc spray product people recommend?

 

Hi

You can use commercially available zinc spray from a can.
The only important thing is that there must be no rust and that the disc should be dry before treatment.
Place the disc in the oven at 50 degrees for 30 minutes.
Tape off the friction surface before treating.


Tom