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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.
Common signs include noisy brakes, vibrations that can be felt on the pedal, and score marks on the rotor. The disc brake rotors are metal discs that work together with the brake pads and calipers to slow the vehicle. When the pedal is depressed, the calipers squeeze the brake pads against the spinning rotors to slow and stop the wheels and the vehicle.