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How many rotors are on a car?

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A brake rotor is a round flat piece of steel attached to a rod that is held in place on the inside of the wheel. On either side of the rotor are brake pads. When you apply the brake pedal on the inside of the car, the pads compress around the rotor, slowing or stopping the vehicle. read more

Most cars built between the 1970's and now had front disc and rear drum, and therefore had two rotors. A three-wheeled car might have three rotors. Higher performance cars, and more and more cars today, have disc brakes all around, making for 4 rotors. read more

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