TRAILER BRAKES WILL NOT RELEASE.

TM 9-2320-273-10

Table 3-1. Troubleshooting - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

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.

Connect air hoses securely to semitrailer. Charge trailer

air system by pushing in trailer air supply control. If

trouble continues, notify Organizational Maintenance.

TRAILER BRAKES WILL NOT RELEASE.

Step 1. Check to make sure that trailer brake hand control is in OFF position.

Move control to OFF position.

Step 2. Check to make sure that trailer air supply control is pushed in

(charging position).

If necessary, push in trailer air supply control.

Step 3. 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.

Step 4. Check for obvious leaks in tractor air system (reservoirs, lines, inter-

vehicuIar hoses).

If you find any leaks in tractor air system, notify Organizational

Maintenance. If you find no evidence of leaks or damage in

truck components, troubleshoot semitrailer.

DRIVELINE LOCKING SYSTEM

DRIVELINE WILL NOT DISENGAGE (INDICATOR LIGHT STAYS ON) WHEN

DIFFERENTIAL LOCK/UNLOCK CONTROL IS MOVED TO THE UNLOCK

POSITION.

Step 1. Make sure you have given system time to disengage.

Leave LOCK/UNLOCK control in UNLOCK position and

wait for light to go off.

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