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TM 9-2320-285-24-1
2-49.
TRAILER BRAKE LINES AND COUPLINGS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. TRAILER SERVICE BRAKES DO NOT FUNCTION (CAB GUARD) (Cont)
Step 2.
a. If indication of test gage on blue hose agrees to within 10 psi
(cont)
of AIR PRESS gage indication, trailer brake system functions properly.
b. If indication of test gage on blue hose differs by more than 10 psi from AIR PRESS gage
indication, notify direct support maintenance.
3. TRAILER SERVICE BRAKES DO NOT FUNCTION (REAR OF TRACTOR)
Step 1.
Remove glad hands from emergency (red) and service (blue) trailer
air hoses and install calibrated air pressure gage on each hose.
With the tractor air system pressure at 100 psi, depress tractor protection valve.
Test gage on red hose should indicate air system pressure (same as AIR PRESS gage indication).
Depress the brake treadle valve fully and watch pressure gage on
blue hose. Test gage on blue hose should indicate air system
pressure (same as AIR PRESS gage indication).
a. If indication of test gage on blue hose agrees to within 10 psi of AIR PRESS gage indication, go
to step 2 below.
b. If indication of test gage on blue hose differs by more than 10 psi from AIR PRESS gage
indication, notify direct support maintenance.
Step 2.
Remove glad hands from emergency (red) and service (blue) trailer
air hoses and install test air pressure gage on each hose.
With the tractor air system pressure at 100 psi, depress tractor protection valve.
Test gage on red hose should indicate air system pressure (same as AIR PRESS gage indication).
Pull trailer hand brake control all the way down.
Test gage on blue hose should indicate air system pressure (same as
AIR PRESS gage indication).
a. If indication of test gage on blue hose agrees to within 10 psi of AIR PRESS gage indication,
trailer brake system functions properly.
b. If indication of test gage on blue hose differs by more than 10 psi from AIR PRESS gage
indication, notify direct support maintenance.
2-538

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