Warning: Refer to Brake Dust Warning in the Preface section.
Note: Any disc brake rotor that exhibits thickness variation exceeding the maximum acceptable level must be refinished or replaced. Thickness variation exceeding the maximum acceptable level can cause brake pulsation.
Ensure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer edge of the rotor, about 13 mm (½ in), for each measurement.
Specification - JD9, JF3, JF7, JH6, JH7 Front and JH6, JH7 Rear
Brake rotor maximum allowable thickness variation: 0.025 mm (0.001 in)
Specification - JD9 Rear
Brake rotor maximum allowable thickness variation: 0.009 mm (0.0004 in)
Note: Whenever a brake rotor is refinished or replaced, the assembled lateral runout (LRO) of the rotor must be measured to ensure optimum performance of the disc brakes.