Good to know. I finally got around to doing the GMT900 front brake upgrade. I live in Oregon and my rotors also get surface rust after sitting for awhile but like yours, it goes away as soon as the brakes are used again. It was definitely a good mod, especially for the money. I'm still on the fence about the hydroboost mod.In case anyone is interested, here's a 5 month update on the Powerstop Z-23 brakes on the front end of the Sled: Braking is much improved over the stock pads/rotors, I do not get any pad dust on the wheels, the rotors are still smooth without any grooves; there is usually some light surface rust on the rotors (I do live in S. Florida after all and they are not stainless steel) after standing for a time but it disappears with the first hop on the pedal. All in all I feel this was a very good value from Summit Racing.
Last edited: