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Brake Lathe A brake lathe machine is used to trim off a small amount of the brake rotor to make the surface smooth and even again.  This process is called “true”.  To true the brake rotor the machine files off a small layer of the rotor on both sides until the rotor is smooth and uniformly even on both sides.  To learn why the rotors need to be periodically trued read our brake rotor warp article http://www.trustmymechanic.com/brakewarp.htm

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