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ROTORS DIAGNOSIS AND TESTING DISC BRAKE ROTORS REAR ROTOR MINIMUM THICKNESS Minimum usable thickness of the rear disc brake rotor Never resurface a rotor if at minimum thickness. Measure rotor (2) thickness at the center of the brake REAR ROTOR THICKNESS VARIATION Variations in rotor thickness will cause pedal pulsation, noise and shudder. Measure rotor thickness at a minimum of six points around the rotor face. Position the micrometer approximately 3/4 Thickness should not vary by more than 0.0005 in. (0.0127 mm.) from point to point on the rotor. Refinish or replace REAR ROTOR LATERAL RUNOUT Check rotor lateral runout whenever diagnosis indi- The rotor must be securely clamped to the hub to Use a dial indicator (1) to check rotor lateral runout. ZH BRAKES - BASE 5 - 37 |