So I Bought This 09 Cobalt SS a couple of months ago. Derek the previous owner had some new pads and rotors laying around so he threw them on the day before I bought the car that was nice of him but since I keep warping these rotors like extremely bad on my third set of just swapping rotors. A retainer spring went missing so I ordered it and put a new pin kit in and put buckets of lube on. I'm not yet sure if its just 1 rotor or both that keep warping. I never ride the brakes and don't usually get on them too hard. Once every three weeks i make about a 1300 mile trip all freeway and thats when they warp they dont warp during town/city driving. Has anyone had problems with caliper pistons seizing up? And if so anywhere to buy rebuild kits. Thanks for reading guys have a nice day

 

CED have Brembo piston kits...sounds weird, are they OEM Rotors?

 

Sweet I may just order 2 kits just give it a try. I'm not sure what brand rotors he put on it when I got the car but I put oriellys the first time I did them then Napa one are on it now.I left Friday night with no warpage by the time I got to MN they we pretty warpednow I'm on my way back and I can't even stand pushing the brakes they are so bad and shake the steering wheel so much. And they are all OEM style rotors with no cross drilled holes or slots

 

are you bedding in the brakes when you isntall new ones?

ive done a few hard stops including a hard 220-60kph and they arent warped or pulsating at all.

Instructions for bedding in your brakes

 

I have purchased Raybestos rotors for LNF for a 'look see'at a very cheap price, and they dont perform compared to stock, and had surface checking in the first few minutes of normal use. Try genuine OEM rotors from CED...

 

I have had horrible luck with aftermarket rotors in the past. Raybestos, even the ones made in the US and Canada, will start to rust or warp and the pads cannot clean off the rust because it is too deep. OEM-spec rotors tend to not rust like that.