H3 L5-3.7L (2007)
edge of the rotor, about 13 mm (1/2 in), for each measurement.
4. Calculate the difference between the highest and lowest thickness measurements recorded to obtain the amount of thickness variation.
5. Compare the thickness variation measurement to the following specification:
Brake rotor maximum allowable thickness variation: 0.025 mm (0.001 in)
Important: 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.
6. If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement.
Brake Rotor Surface and Wear Inspection
Brake Rotor Surface and Wear Inspection
Caution: Refer to Brake Dust Caution.
1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads.
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Inspect the friction surfaces of the brake rotor for the following Braking Surface Conditions:
^
Heavy rust and/or pitting
Light surface rust can be removed with an abrasive disc. Heavy surface rust and/or pitting must be removed by refinishing the rotor.
^
Cracks and/or heat spots
^
Excessive blueing discoloration
4. If the friction surfaces of the brake rotor exhibit one or more of the Braking Surface Conditions, the rotor requires refinishing or replacement.
5. Using a micrometer calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the scoring depth of any grooves
present on the rotor friction surfaces.
6. Compare the groove scoring depth recorded to the following specification:
Brake rotor maximum allowable scoring: 1.50 mm (0.059 in)
7. If the brake rotor scoring depth exceeds the specification, or if an excessive amount of scoring is present, the rotor requires refinishing or
replacement.
Brake Rotor Assembled Lateral Runout Measurement
Brake Rotor Assembled Lateral Runout Measurement
Tools Required
*
J 39544-KIT Complete Torque Socket Set-10 Pieces, or equivalent
*
J 41013 Rotor Resurfacing Kit
*
J 42450-A Wheel Hub Resurfacing Kit
*
J 45101 Hub and Wheel Runout Gage
*
J 45101-100 Conical Brake Rotor Washers
Caution:Refer to Brake Dust Caution.
Important: