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TM 9-2320-364-20-2
2-1782
5. PARKING BRAKES ON AXLE NO. 3 DO NOT APPLY (CONT).
Parking brakes on Axles No. 4
and No. 5 operate correctly.
Both brakes on Axle No. 3 OK.
Air lines OK.
Relay spring valve No. 1 OK.
Air chambers faulty.
Brakes faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Operation test.
If the air chamber rods bind as
they travel in chambers, they
will not permit parking brake to
apply.
YES
NO
Replace air chamber
(Para 12-10).
Verify repair, go to
Step 6 of this Fault.
4.
Does air chamber operate
correctly?
3.
Does the relay spring valve
No. 1 operate correctly?
Replace relay spring
valve No. 1
(Para 12-16). Verify
repair, go to Step 6 of
this Fault.
YES
NO
Parking brakes on Axles No. 4
and No. 5 operate correctly.
Both brakes on Axle No. 3 OK.
Air lines OK.
Relay spring valve No. 1
faulty.
Air chambers faulty.
Brakes faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Relay spring valve No. 1 test.
If relay spring valve No. 1 fails
open, it will not exhaust air from
air lines and apply brakes.
WARNING
WARNING
Read WARNING
on Page 2-1783
Read WARNING
on Page 2-1783
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