Parallelism

Parallelism is the measurement of thickness of the rotor at four or more points around the circumference of the rotor. All measurement must be made at 29 mm (1.14 inch) from the edge of the rotor.

Measuring Thickness Of Rotor:

The rotor thickness must not vary more than 0.010 mm (0.0004 inch) from point to point.
Maximum runout: 0.010 mm (0.0004 inch)