8-2. Section 4 includes a brief description of the
operation of the air brakes. This section covers the
servicing of the air brake assembly.
FIGURE 8-1. FOUNDATION BRAKE.
8 - 9 . Before removal, support the trailer on blocks
and remove the hub and drum (see Section 11). With
this step complete, proceed as follows:
a. Remove brake shoe retainer springs and gently
lower shoes to prevent damage.
b. Remove the yoke pin from the slack adjuster.
c. Remove the snap rings at the slack adjuster
and brake spider.
d. Remove the slack adjuster.
The cam retainer washer
e. Pull camshaft out.
and cam spacer washer will also come off with the
f. Remove the grease seals and the spider bush-
ing from the spider.
8-10. CLEANING AND INSPECTION.
8 - 1 1 . Clean metal parts in solvent. Check condi-
tion of the brake drum, linings, cam rollers, cam
8-1 Change 3