Table 3-1. Troubleshooting - Continued
TEST OR INSPECTION
3. TRAILER BRAKES WILL NOT APPLY WHEN BRAKE PEDAL IS USED OR
HAND CONTROL ON STEERING COLUMN IS USED.
Check to make sure that both intervehicular air hoses are connected securely
to semitrailer connections (refer to paragraph 2-16).
Connect air hoses securely to semitrailer. Charge trailer
air system by pushing in trailer air supply control. If
notify Organizational Maintenance.
TRAILER BRAKES WILL NOT RELEASE.
Check to make sure that trailer brake hand control is in OFF posi-
Move control to OFF position (refer to paragraph 2-3).
Check to make sure that trailer air supply control is pushed in
If necessary, push in trailer air supply control.
Check to make sure that both intervehicular air hoses (service to
service and emergency to emergency) are securely connected
between tractor and semitrailer.
If necessary, connect hoses securely (refer to paragraph
Check for obvious leaks in tractor air system (reservoirs, lines,
If you find any leaks in tractor air system, notify Organi-
zational Maintenance. If you find no evidence of leaks
or damage in truck components, troubleshoot semitrailer.
DRIVELINE AIR CONTROL SYSTEM
DRIVELINE WILL NOT DISENGAGE (INDICATOR LAMP STAYS ON) WHEN
DIFFERENTIAL LOCK/UNLOCK IS MOVED TO THE UNLOCK POSITION.
Make sure you have given system time to disengage.
Leave LOCK/UNLOCK control in UNLOCK position and
wait for lamp to go off (refer to paragraph 2-1).
If LOCK indicator lamp stays on after you have given system time
to disengage, excessive driveline windup may have occurred.
Back up slowly, and check to see whether LOCK indicator
lamp goes off. If indicator lamp remains on, notify Organi-