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TM 9-2320-364-20-2
2-1796
7. TRAILER SERVICE BRAKES DO NOT APPLY WHEN HAND CONTROL VALVE
IS OPERATED.
INITIAL SETUP
1.
Are air lines 2663, 2653 and
2661 free from crimps and/or
leaks and are fittings, valves
and gladhand free of leaks?
Replace air lines
and/or tighten/replace
fittings and/or valves,
gladhand (Para 12-11,
12-36, 12-45, 12-46,
12-43 and see
schematic Fig 2-43).
Verify repair, go to
Step 5 of this Fault.
START
YES
NO
Nothing.
Air lines crimped or leaking
and/or fittings, valves or
gladhand leaking.
Hand brake valve faulty.
Front double check valve
(middle) faulty.
Tractor protection valve faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Visual inspection.
Audible inspection.
If air lines and/or fittings,
valves or gladhand are
leaking, loss of air pressure
will prevent trailer brakes from
operating correctly.
2-24. BRAKES SYSTEM TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
Pressure Test Kit (Item 50, Appendix G)
Personnel Required
Two
Equipment Condition
Engine OFF, (TM 9-232-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-2320-385-14
WARNING
Materials/Parts
Locknuts (6) (Item 110, Appendix F)
Read WARNING
on Page 2-1797
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