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TM 9-2320-364-20-2
2-1790
6. PARKING BRAKES ON AXLES NO. 4 AND NO. 5 DO NOT APPLY (CONT).
Brakes on Axle No. 3 operate
correctly.
All parking brakes on Axles
No. 4 and No. 5 fail to apply.
Air lines OK.
Relay spring valve No. 2
faulty.
Air chambers faulty.
Brakes faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Pressure test.
YES
NO
Replace relay spring
brake valve No. 2
(Para 12-17). Verify
repair, go to Step 6 of
this Fault.
3.
Does the relay spring brake
valve No. 2 operate correctly?
If relay spring valve No. 2 fails
open, it will not exhaust air from
lines and apply brakes.
WARNING
Read WARNING
on Page 2-1791
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