Yeah, X2 on that advice. Light surface rust is one thing, as your rotors are constantly rusting, your pads just knock it off. But heavy rust and pitting is bad. You can have the rotors turned for about $15 a piece, or just replace them. They arent too expensive. You can get cheap foreighn knockoffs from Advance, Autozone, etc... for really cheap. May not last as long, but they meet the safety requirments.