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Most auto parts stores offer a brake lathe service for drums and rotors. It is essential that the friction surface of the rotor is prepared properly for the brakes to work their best. When cutting drums or rotors, the goal is to remove the least amount of material to create a true surface. If the rotor is warped, it will cause a pulsing in the brake pedal when stopping. A second benefit of turning the rotor is the removal of the glaze that is created by the brake pad. Better brands of new drums and rotors leave extra material so they can be cut before they go into service to guarantee a true surface. If the parts were dropped during shipment they will be warped.