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BRAKES WILL NOT RESPOND PROPERLY-continued |
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 TM
9-2320-279-20-1
Troubleshooting Malfunctions (Cent)
Malfunction
Test or Inspection
Corrective Action
DUAL AIR BRAKE SYSTEM
1.
BRAKES WILL NOT RESPOND PROPERLY
BRAKE
TREADLE
VALVE
STOP
LIGHT
SWITCHES
Step 8. Check for defective brake treadle valve. Remove both stoplight switches from brake treadle
valve. Apply service brakes and listen for air escaping from brake treadle valve stoplight
switch holes.
If air is not heard escaping from both holes, replace defective brake treadle valve
(para 11-10).
If air is heard escaping, inspect double check valve in line No. 489 (all models) or
in line No. 489A (M984E 1 only) for damage. Replace damaged double check valve
(para 11-14 or 11-15).
2-165
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