Section 250 (Disc Brake System & Drum Brake System): Overhaul: Rotor: Parallelism
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- Parallelism can be tested by 2 testing procedures. Using a micrometer, measure rotor thickness at 12 points, approximately 30 degrees apart and 1.00" (25.4 mm) from outer edge of rotor. Difference must not exceed specification. See DISC BRAKE SPECIFICATIONS . Resurface or replace rotor as required.
- Mount rotor on a brake lathe. Attach 2 dial indicators, one on each side of rotor, with tip of indicators contacting rubbing surface of rotor directly opposite each other and 1.00" (25.4 mm) from outer edge of rotor. Zero both indicators, and rotate rotor. Note indicator reading. If reading exceeds specification, resurface or replace as required. See DISC BRAKE SPECIFICATIONS tables.