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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.
When brake pads make contact with brake rotors, they do eventually clear the thin layer of rust on the contact areas so that they can continue to do their job. However, there are other deleterious effects of rusty brake rotors.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.