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BRAKES WILL NOT RESPOND PROPERLY-continued |
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 TM
9-2320-279-20-1
Troubleshooting Malfunctions (Cont)
2-15. TROUBLESHOOTING INSTRUCTIONS (CONT).
Table 2-9. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
DUAL AIR BRAKE SYSTEM (CONT)
1.
BRAKES WILL NOT RESPOND PROPERLY (CONT).
Step 6. Check air supply to brake relay valve. Drain air system. Loosen supply line at brake relay
valve. Start engine and build air pressure, listen for air escaping from supply hose.
If no air is heard escaping from supply hose, inspect supply hose for kinks or
restrictions. Repair or replace air lines as required (para 11-35).
Step 7. Check for correct control air supply. Loosen control line at brake relay valve. Apply service
brake and listen for air escaping from control air supply hose.
If air is heard escaping, replace defective brake relay valve (para 11-12).
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