Rotor Refinishing

Rotor braking surfaces can be sanded or machined in a disc brake lathe.
The lathe must machine both sides of the rotor simultaneously with dual (two) cutter heads. Equipment capable of machining only one side at a time will produce a tapered rotor.

Fig 6 Refacing Brake Disc:

The lathe should also be equipped with a grinder attachment or dual sanding discs for final cleanup or light refinishing.

Fig 7 Refacing Brake Disc -- Final Finish:

If the rotor surfaces only need minor cleanup of rust, scale, or minor scoring, use abrasive discs to clean up the rotor surfaces. However, when a rotor is scored or worn, machining with cutting tools will be required.

CAUTION: Do not machine the rotor it it will cause the rotor to fall below minimum allowable thickness.