Quote:
Originally Posted by Can'tHave2MuchHP
This is true for all high performance steel brakes. They'll develop surface oranging almost immediately, within minutes of rinsing. It's not really "rust" though in the sense that there's structural damage happening. It comes completely off at the first brushing of the brake pads when driving/moving the car. It's just EXTREMELY raw metal, and extremely raw metal reacts very quickly to environmental changes.
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+1, although I have found it may actually be the pad deposit layer on the rotors that causes the rust color, not the rotor steel itself. I had switched to ceramic Z26 street brake pads for a month, and after washing, I distinctly noticed they did NOT have the orange rusty finish! The "rustiness" returned after I went back to OEM pads.
Anyway, OP, +1 to the others' suggestion, definitely drive the car after washing and get a couple 30-0mph braking points in (stop signs, etc) before parking to avoid the stuck pads.