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

When reline the brakes, lubricate the camshaft and check the camshaft for wear. The brake chamber/camshaft support bracket includes the following components:

The space between the bushings serves as the lubricant reservoir. Apply lubricant sparingly at the specified intervals. Refer to Fluid and Lubricant Recommendations.

1. Remove the brake linings. Refer to Brake Shoe Replacement.



2. Check the up-and-down and the side-to-side end play of the camshaft in order to determine if the camshaft bushings need replacement. Replace the camshaft bushings if the total movement is more than 0.76 mm (0.030 in).



3. Remove the air brake automatic slack adjuster (4). Refer to Air Brake Automatic Slack Adjuster Replacement.



4. Pull the camshaft out from the brake chamber/camshaft support bracket.
5. Remove the camshaft.



6. Remove the camshaft seals (11).
7. Remove the camshaft bushings if needed (10).
8. Clean the old grease from the camshaft (12).



9. Clean the old grease from the chamber/camshaft support bracket (8).



10. Inspect the camshaft bearing surface areas for wear and corrosion.

Replace the camshaft (12) if the camshaft bearing surfaces show signs of wear or roughness.

11. Inspect the camshaft for wear or flat spots on the roller surfaces.

Replace the camshaft (12) if any obvious wear or flat spots exist.

12. Inspect the camshaft splines for damage or wear.

Replace the camshaft (12) if the camshaft splines are damaged.

13. Inspect the camshaft bushings (10) for deterioration.

Replace the camshaft bushings (10) if needed.

1. Install the camshaft bushings if needed.
2. Drive the camshaft bushings in the brake chamber/camshaft support bracket with a seal driver.



3. Install the new camshaft seals with the camshaft seal lips toward the air brake automatic slack adjuster.



4. Apply a coat of grease to the camshaft bushings.
5. Install the camshaft.
6. Install the air brake automatic slack adjuster. Refer to Air Brake Automatic Slack Adjuster Replacement.
7. Install the brake linings. Refer to Brake Shoe Replacement.