Table 4-3. Unit Troubleshooting (Continued)
TEST OR INSPECTION
BRAKES GRAB OR BIND.
Inspect brake shoes for damage or excessive wear.
Inspect air brake chambers.
BRAKES MAKE EXCESSIVE SQUEALING OR GRINDING NOISE WHEN APPLIED.
Inspect brake drum for wear or damage.
Notify Direct Support Maintenance.
Inspect brake shoes for excessive wear.
BRAKES FAIL TO ENGAGE.
Check Control (blue/service) Air Line connection at gladhand.
If no air is flowing from prime mover, problem is with prime mover.
Inspect Control Air Line for damage.
Inspect spring brake control valve for proper function.
Check for proper function of brakes.
Check brake system hardware for damaged or missing components.
Replace brake system components as necessary.
SLOW BRAKE APPLICATION OR SLOW RELEASE.
Check for restrictions in air lines and hoses.
If air lines or hoses are restricted.
If air lines and hoses are not restricted, proceed to step 2.
Check ECU valve operation.
If ECU valve is not defective, proceed to step 3.