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do you think the same would happen with after market rotors?
It's NORMAL! Bare metal will rust and quite quickly when wet and exposed to the air. It's NORMAL. EVERY brake rotor in the world regardless of make, model, or brand will rust as described in this thread. What should NOT rust is the hat of the rotor and the area NOT rubbed by the brake pads.
As soon as 1 (one) application of the brakes occurs, all rust is cleared off and the surface is shiny again.
It's NORMAL! Bare metal will rust and quite quickly when wet and exposed to the air. It's NORMAL. EVERY brake rotor in the world regardless of make, model, or brand will rust as described in this thread. What should NOT rust is the hat of the rotor and the area NOT rubbed by the brake pads.
As soon as 1 (one) application of the brakes occurs, all rust is cleared off and the surface is shiny again.
Elmer
Zinc-coated rotors prevent rusting at the hub area (hat) and at the vanes, but, will show a little surface rust after rain or washing until the pads are applied. Then you just get rust dust on the wheels. OEM rotors and non zinc-coated aftermarket rotors will rust in all these places, unless of course you paint the hats and vanes with rust resistant high heat paint that is.
The only way I can think of to avoid rusty rotors is to replace them with rotors made of something that doesn't rust, like carbon fiber or maybe stainless steel or aluminum. Whatever that material may be, it would have to grip like machined steel and absorb (and then radiate) huge amounts of heat without warping, scoring, cracking, or wearing out in a few hundred miles. That pretty much sums up the problems you'd have with carbon fiber brakes.
All rotors will rust on the "FIRE PATH" where the pad touches the rotor, it the rest of the rotor that shouldn't rust if they were properely treated.
As you can the rotors on my 06 look like crap after 2 days on the track
That's why I'm replacing them with some DBA slotted performance rotors
Rust is normal, as said several times. I would not put anything on the rotors. You can take the rust off with sandpaper or such and clean with brake cleaner, if you want them in show condition, but no oil.
I also have seen some surface rust on what was supposed to be stainless, maybe it was a low grade or something.