Sierra Denali AWD V8-6.0L VIN N (2004)
place before removing the J 45101-100 and the lug nuts.
Brake Rotor Assembled Lateral Runout (LRO) Correction - On-Vehicle Lathe
Brake Rotor Assembled Lateral Runout (LRO) Correction - On-Vehicle Lathe
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Tools Required
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J 45101-100Conical Brake Rotor Washers
Caution: Refer to Brake Dust Caution in Service Precautions.
Important:
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Brake rotor thickness variation MUST be checked BEFORE checking for assembled lateral runout (LRO). Thickness variation exceeding the
maximum acceptable level can cause brake pulsation. Refer to Brake Rotor Thickness Variation Measurement.
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Brake rotor assembled lateral runout (LRO) exceeding the maximum allowable specification can cause thickness variation to develop in the brake
rotor over time, usually between 4,800-11,300 km (3,000-7,000 mi). Refer to Brake Rotor Assembled Lateral Runout (LRO) Measurement.
1. Ensure that the caliper and caliper bracket that are already being supported, are clear from contacting any rotating components, such as the brake
rotor.
2. Remove the J 45101-100 and the lug nuts that were installed during the assembled LRO measurement procedure and/or the indexing correction
procedure.
3. Inspect the mounting surface of the hub/axle flange and the brake rotor to ensure that there are no foreign particles or debris remaining.
4. Set up the lathe, following the manufacturer's instructions.
5. Refinish the brake rotor, following the brake lathe manufacturer's instructions.
6. After each successive cut, inspect the brake rotor thickness. Refer to Brake Rotor Thickness Measurement.
7. If at any time the brake rotor exceeds the minimum allowable thickness after refinish specification, the brake rotor must be replaced. After
replacing the rotor, proceed to step 10.
8. After refinishing the brake rotor, use the following procedure in order to obtain the desired non-directional finish:
1. Follow the brake lathe manufacturer's recommended speed setting for applying a non-directional finish
2. Using moderate pressure, apply the non-directional finish:
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If the lathe is equipped with a non-directional finishing tool, apply the finish with 120 grit aluminum oxide sandpaper
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If the lathe is not equipped with a non-directional finishing tool, apply the finish with a sanding block and 150 grit aluminum oxide
sandpaper
3. After applying a non-directional finish, clean each friction surface of the brake rotor with denatured alcohol, or an equivalent approved brake
cleaner
9. Remove the lathe from the vehicle.
10. Measure the assembled LRO of the brake rotor. Refer to Brake Rotor Assembled Lateral Runout (LRO) Measurement.
11. If the brake rotor assembled LRO measurement still exceeds the maximum allowable specification, refer to Brake Rotor Assembled Lateral
Runout (LRO) Correction.
12. If the brake rotor assembled LRO is within specification, install the brake caliper and depress the brake pedal several times to secure the rotor in
place before removing the J 45101-100 and the lug nuts.
Brake Rotor Refinishing
Brake Rotor Refinishing
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Tools Required
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J 41013 Rotor Resurfacing Kit
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J 42450-A Wheel Hub Resurfacing Kit
Caution: Refer to Brake Dust Caution in Service Precautions.
Important:
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The disc brake rotors do not require refinishing as part of routine brake system service. New disc brake rotors do not require refinishing.Do not
refinish disc brake rotors in an attempt to correct the following conditions:
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Brake system noise - squeal, growl, groan
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Uneven and/or premature disc brake pad wear
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Superficial or cosmetic corrosion/rust of the disc brake rotor friction surface
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Scoring of the disc brake rotor friction surface less than the maximum allowable specification
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Before refinishing a brake rotor, the rotor MUST first be checked for adequate thickness to allow the rotor to be refinished and remain above the
minimum allowable thickness after refinish specification. Refer to Brake Rotor Thickness Measurement. Disc brake rotors should only be
refinished if they have adequate thickness to be refinished and if one or more of the following conditions exist:
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Thickness variation in excess of the maximum allowable specification
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Excessive corrosion/rust and/or pitting
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Cracks and/or heat spots
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Excessive blueing discoloration
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Scoring of the disc brake rotor surface in excess of the maximum allowable specification
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Disc brake rotors may need to be refinished as part of the process for correcting brake rotor assembled lateral runout (LRO) that exceeds the
maximum allowable specification.
1. Important:
