UNIT TROUBLESHOOTING - CONTINUED
TEST OR INSPECTION
9. BRAKES DO NOT HOLD - FRONT OR REAR DOLLY ONLY
Step 1. Check adjustment of brakes.
Adjust brakes as necessary (page 4-119). If brakes are adjusted properly go to
Step 2. Check for grease on brake linings (1).
Replace brake linings and grease seal if necessary (page 4-103). If there is no
grease on the brake linings go to step 3.
Step 3. Check amount of brake linings remaining.
Replace brake shoe if amount of lining remaining is less than 1/16 inch. If
enough brake lining remains go to step 5.
Step 4. Check for restricted air lines.
Loosen air line (2) at individual wheel brake air chamber (3). Apply brakes. If
air escapes, go to step 5. If no air escapes, locate and remove restriction. If
problem is on the rear dolly, also check for restricted interdolly hose (4).
Step 5. Check for proper braking action of individual brake in wheel end assembly (5).
Slightly loosen wheel end assembly so braking action of brake assembly (6) can
be observed. Gently apply brakes. If the parts of the brake assembly move
apart, it indicates the brake assembly is working. If there is no movement in the
brake assembly there is air leakage, replace the brake assembly (6) (page 4-
Step 6. Refer to Section IX for additional brake system maintenance information.