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TM 9-2320-364-20-2
2-1754
2. PARKING BRAKES ON AXLE NO. 3 DO NOT RELEASE (CONT).
Parking brakes on Axles No. 4
and No. 5 operate correctly.
Both brakes on Axle No. 3 fail
to release.
Air lines and fittings OK.
Relay spring valve No. 1
is leaking.
Relay spring valve No. 1 is
faulty.
Air chambers faulty.
Brakes faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Visual inspection.
Audible inspection.
YES
NO
3.
Is relay spring valve No. 1 free
from leaks?
If relay spring valve No. 1 is
leaking, loss of air pressure will
prevent brakes from operating
properly.
WARNING
Replace relay spring
valve No. 1
(Para 12-18).
Verify repair, go to
Step 7 of this Fault.
Read WARNING
on Page 2-1755
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