Rotor Servicing: Parallelism

Parallelism can be tested by 2 different testing procedures. First test should be performed as follows:

1. Using a micrometer, measure rotor thickness at 12 points approximately 30 degrees apart, and at 1" (25 mm) from outer edge of rotor. Difference must not exceed specifications. See DISC BRAKE SPECIFICATIONS  . Resurface or replace rotor as required.
2. Using a brake lathe, attach 2 dial indicators, one on each side of rotors with tip of indicator contacting rubbing surface of rotor directly opposite each other and at 1" (25 mm) from outer edge of rotor. Note indicator reading. If reading exceeds specification, resurface or replace as required. See DISC BRAKE SPECIFICATIONS  .