Table 4-2. Unit Troubleshooting - Continued

TM 5-4930-233-14

TM 4930-14/1

Table 4-2. Unit Troubleshooting - Continued

ITEM

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2. Check brake system for leaks or damage.

Fix leaks or damage, replacing parts if required.

Step 3. Check for clogged air filter.

Replace air filter (para 4-50).

Step 4. Check for improperly adjusted brakes (para 4-58).

Adjust brakes (para 4-58).

Step 5. Check for air in the hydraulic system by bleeding the brakes (para 4-58).

11.

BRAKES GRAB OR FAIL TO RELEASE

Step 1. Check for moisture in air reservoir.

Drain the reservoir.

Step 2. Check brakes for correct adjustment.

Adjust as needed (para 4-58).

Step 3. Check for out-of-round, cracked, or damaged brake drum.

Notify direct support maintenance.

12.

ALL LIGHTS ARE OUT

Step 1. Check towing vehicle light operation

Troubleshoot towing vehicle electrical (Towing Vehicle Technical Manual).

Step 2. Test wiring harness (para 4-56).

Replace or repair as required (para 4-56).

Step 3. Test junction box (para 4-53).

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