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Brake Disc Assembled Lateral Runout Correction -- On Vehicle Lathe

Special Tools

CH-45101-100 Conical Brake Disc Washers

For equivalent regional tools, refer to Special Tools .

Warning: Refer to Brake Dust Warning in the Preface section.

Note: 

•	Brake disc 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 Disc Thickness Variation Measurement .

•	Brake disc assembled LRO exceeding the maximum allowable specification can cause thickness variation to develop in the brake disc over time, usually between 4 800-11 300 km (3,000-7,000 mi). Refer to Brake Disc Assembled Lateral Runout Measurement .

1. Ensure that the calliper and calliper bracket that are already being supported, are clear from contacting any rotating components, such as the brake disc.
2. Remove the CH-45101-100 Conical Brake Disc Washers 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 disc 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 disc, following the brake lathe manufacturer's instructions.
6. After each successive cut, inspect the brake disc thickness. Refer to Brake Disc Thickness Measurement .
7. If at any time the brake disc exceeds the minimum allowable thickness after refinish specification, the brake disc must be replaced. After replacing the disc, proceed to step 10.
8. After refinishing the brake disc, use the following procedure in order to obtain the desired non-directional finish:

8.1.	Follow the brake lathe manufacturer's recommended speed setting for applying a non-directional finish.

8.2.	Using moderate pressure, apply the non-directional finish:

•	If the lathe is equipped with a non-directional finishing tool, apply the finish with 120-grit aluminium oxide sandpaper.

•	If the lathe is not equipped with a non-directional finishing tool, apply the finish with a sanding block and 150-grit aluminium oxide sandpaper.

8.3.	After applying a non-directional finish, clean each friction surface of the brake disc with methylated spirit, or an equivalent approved brake cleaner.

9. Remove the lathe from the vehicle.
10. Measure the assembled LRO of the brake disc. Refer to Brake Disc Assembled Lateral Runout Measurement .
11. If the brake disc assembled LRO measurement still exceeds the maximum allowable specification, refer to Brake Disc Assembled Lateral Runout Correction .
12. If the brake disc assembled LRO is within specification, install the brake calliper and depress the brake pedal several times to secure the disc in place before removing the CH-45101-100 Conical Brake Disc Washers and the lug nuts.