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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.
Causes for Rust on Brake Rotors. Rust develops on the rotors when they become wet and then sit for an extended period of time. It is easy and normal for rotors to get wet, as simply driving in the rain will cause this. It is also normal for a car to sit in a garage for a few days at a time.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.