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My girodisc rotor hats have turned bright purple, while the OEM rotor hats are still black. It looks to me like girodisc uses inferior anodizing that doesn't last longer than a year (conveniently their warranty period).
First they blamed it on racing, even though the Corvette hasn't been tracked. Then they blamed it on water, but it's hand washed with waterless wash. Then they blamed it on soap, but the car never has seen any harsh soaps or detergents.
Either way, they're trying to blame it on everything but their own product quality, and have stopped responding.
Girodisc does not stand behind the quality of their product, and neither does KNS brakes.
I've got a Girodisc set ready to put on my GS so I don't have personal experience yet. My understanding was they would turn darker after repeated heat cycles on track. I'm no longer tracking so will be interesting to see what mine do. Thanks for posting!
I've got a Girodisc set ready to put on my GS so I don't have personal experience yet. My understanding was they would turn darker after repeated heat cycles on track. I'm no longer tracking so will be interesting to see what mine do. Thanks for posting!
Seems like paint or powdercoat would work if you care about the discoloration.
Ok, and what do I use to brake while I wait for the work to be done? Just run the car without rotors?
It means I'd have to buy another set just so I can use the car while this set is being refinished. I'm not looking to spend that kind of money on something that shouldn't have happened to begin with.
Take your preferred steps as any other work you do on a car.
Any other work is usually covered by warranty, which provides a rental. I think the company should stand behind its product and just send a new set of hats, at which point I can swap them out and send the old ones back with minimal downtime. That would be the right thing to do. Why should I be inconvenienced and spend money to fix a bad product?
Any other work is usually covered by warranty, which provides a rental.
This isn't a mechanical problem, so I would just remove them and paint. It can be a weekend project. Alternatively, buy non-girodisc since you don't even need girodisc rotors. Sell these for a discount on the forum, since someone like me that is a track rat won't care about discoloration much, especially if it means a slight discount.
This isn't a mechanical problem, so I would just remove them and paint. It can be a weekend project. Alternatively, buy non-girodisc since you don't even need girodisc rotors. Sell these for a discount on the forum, since someone like me that is a track rat won't care about discoloration much, especially if it means a slight discount.
They are exceptional rotors designed for track use. The front rotors are ~1lb/side lighter. The rear rotors are ~8lbs lighter/side than OEM due to the use of aluminum hats. For a street driven car, there should have been no reason to replace the OEM rotors, much less move to aftermarket if appearance was the primary concern. The OEM rotors are virtually indestructible on the street and will last many 10s of thousands of miles. They will get pad deposits on them if the driver likes to drag the brakes for looooooooooooong gradual stops. This is easily removed with a sanding disc or wire wheel on a drill.
Nowhere that I can find on their website do they state the hats won't change color. Good thing they weren't iron or they'd be rusted.
Sounds like you should buy a new set of OEM rotors and sell the Girodiscs
They are exceptional rotors designed for track use. The front rotors are ~1lb/side lighter. The rear rotors are ~8lbs lighter/side than OEM due to the use of aluminum hats. For a street driven car, there should have been no reason to replace the OEM rotors, much less move to aftermarket if appearance was the primary concern. The OEM rotors are virtually indestructible on the street and will last many 10s of thousands of miles. They will get pad deposits on them if the driver likes to drag the brakes for looooooooooooong gradual stops. This is easily removed with a sanding disc or wire wheel on a drill.
Nowhere that I can find on their website do they state the hats won't change color. Good thing they weren't iron or they'd be rusted.
Sounds like you should buy a new set of OEM rotors and sell the Girodiscs
...and yes, I run them on track
I had to replace my OEM rotors at 50k miles. They had worn down below the minimum recommended thickness. KNS brakes was recommended so I called them and they recommended these...
It should be the other way around. Chevy also doesn't state my Admiral blue Corvette does not turn color, but the reasonable expectation is for it to remain blue. If you sell a black product and it's known to change color they should mention it. The reasonable expectation is for it to remain black. Otherwise they should just sell purple rotor hats and then I wouldn't have bought them.
Anyways, your purple looks nicer than mine. Mine is almost pink now and the finish is flaking off, leaving streaks. It's just cheap anodizing. They didn't use enough or high enough quality dye.
Last edited by Lancevance; 08-02-2023 at 01:18 PM.
Girodisc orobsbly used type 1 or 2 anodizing. You can have it send out for type 3 hard anodizing which should be a lot more robust and hold its color over time.
08-02-2023, 10:49 AM
Don't buy girodisc rotors!
