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TM 9-2320-364-20-2
2-1802
7. TRAILER SERVICE BRAKES DO NOT APPLY WHEN HAND BRAKE VALVE IS
OPERATED (CONT).
Air lines free of crimps or leaks
and fittings, front double check
valve (middle) and gladhand
free of leaks.
Hand brake valve OK.
Front double check valve OK.
Tractor protection valve OK.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Verify repair.
If trailer service brakes apply
when hand brake valve is
operated, fault has been
corrected.
YES
NO
Fault not corrected.
Notify DS
Maintenance.
5.
Do trailer service brakes
apply when hand brake valve
is operated?
4.
Does tractor protection valve
operate correctly?
Replace tractor
protection valve
(Para 12-45).
Verify repair, go to
Step 5 of this Fault.
YES
NO
Air lines free of crimps or leaks
and fittings, valves and
gladhand free of leaks.
Hand brake valve OK.
Front double check valve
(middle) OK.
Tractor protection valve faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Tractor protection valve test.
If the tractor protection valve
fails closed, air pressure will not
be available to actuate the
trailer service brake relay
valves.
WARNING
Fault corrected.
Read WARNING
on Page 2-1803
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