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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.
First rotors are a disposable items and will need replacing anywhere from 15,000 to 70,000 miles into their use depending on your driving style and the type of brake pads used. Some brake pads are much more aggressive than others.A sign of a fairly aggressive pad is one which makes a lot of dust.efore you replace brake rotors look at these photos which will guide you on whether you need to replace brake rotors or you can salvage them. This is a typical cross drilled rotor and what it will look like after about 40-50,000 miles commonly fitted to Jaguar, Mercedes and Audi cars.