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TM 9-2320-364-20-2
2-1800
7. TRAILER SERVICE BRAKES DO NOT APPLY WHEN HAND BRAKE VALVE IS
OPERATED (CONT).
3.
Does front double check
valve (middle) operate
correctly?
Replace front double
check valve (middle)
(Para 12-11).
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.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Front double check valve
(middle) test.
If front double check valve
(middle) fails closed on trailer
side of valve, air pressure will
not be available to apply the
trailer service brakes.
WARNING
Front double check valve
(middle) faulty.
Tractor protection valve faulty.
Read WARNING
on Page 2-1801
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