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conventional automotive brake rotors are cast from G3000 grey cast iron. These work well with a pad material designed to operate using adherent friction. Most of the European system rotors are cast from a high carbon G4000 grey cast iron. These work well with a pad designed to operate using abrasive friction, such that the rotor is sacrificial just like the pad.
It is normal for brake rotors to rust and for brake pads to then remove the rust in the critical contact areas with the rotors as drivers brake their vehicles. Although rusty brake rotors are unlikely to cause a hazardous situation, having rust-proof rotors does possess a few benefits.he three options for brake rotors that do not rust are zinc-plated rotors, cadmium-plated rotors, and carbon composite rotors. Each has its own costs and benefits, so drivers should weigh these before deciding where to buy these rotors.