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TM 9-2320-364-20-2
2-1774
4. PARKING BRAKES ON AXLES NO. 3 THROUGH NO. 5 DO NOT APPLY (CONT).
Air lines OK.
Dash manifold valve OK.
Spring brake valve faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Spring brake valve test.
If spring brake valve fails closed
after the parking brakes are
released, air hoses between
spring brake valve and relay
spring valves will not exhaust
air. This will cause relay spring
valves to remain actuated and
release brakes.
YES
NO
Replace spring brake
valve (Para 12-18).
Verify repair, go to
Step 4 of this Fault.
3.
Does spring brake valve
operate correctly?
2.
Does dash manifold valve
operate correctly?
Replace dash
manifold valve
(Para 12-37).
Verify repair, go to
Step 4 of this Fault.
YES
NO
Air lines OK.
Dash manifold valve faulty.
Spring brake valve faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Dash manifold valve test.
If parking brake control valve in
dash manifold valve fails
opened (pushed), air hoses
between the manifold valve and
the relay spring valves will not
exhaust air. This will cause relay
spring valves to remain actuated
and release brakes.
WARNING
Read WARNING
on Page 2-1775
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