TM9-2330-372-14&P
TABLE 3-1. OPERATOR TROUBLESHOOTING TABLE-continued
Malfunction
Test or Inspection
Corrective Action
AIR BRAKE SYSTEM
6. BRAKES WILL NOT RELEASE.
Step 1.
Check connection of air hoses between towing vehicle and trailer.
a. If air hoses are not properly connected, (Emergency to Emergency, Service to Service), shut
off towing vehicle air supply, disconnect air hoses, and reconnect.
b. If air hoses are connected properly, proceed to Step 2.
Step 2.
Check for moisture in air system.
WARNING
Wear protective goggles when operating drain cock and avoid air blast or eye injury may occur.
a. Open drain cock on reservoir and bleed moisture from system.
b. If no moisture is present, and malfunction still exists, notify organizational maintenance.
7. NO BRAKES OR WEAK BRAKES.
Step 1.
Check shut-off valve on towing vehicle.
a. If shut-off valve on towing vehicle is off, open shut-off valve.
b. If shut-off valve on towing vehicle is open, then proceed to Step 2.
Step 2.
Check air pressure gage on towing vehicle.
a. If air pressure gage indicates low air pressure, check that drain cock on air reservoir is closed.
b. If drain cock on reservoir is closed, and air pressure gage - indicates proper amount of
pressure in air system, proceed to Step 3.
3-8
