TM-9-2320-283-20-1

TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1

TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3

DECEMBER 1983

TM-9-2320-283-20-1 - Page 430 of 926

TM 9-2320-283-20-1

TROUBLESHOOTING.

2-11.

TROUBLESHOOTING PROCEDURES (Continued).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

111.

SERVICE BRAKES WILL NOT RELEASE (ONE WHEEL ONLY).

Troubleshoot brakes.

Refer to brake malfunctions 109 and 110.

112.

SERVICE BRAKES WILL NOT APPLY.

Step 1.

Check pressure gages in cab.

Operate engine to build up proper pressure.

(Refer to TM 9-2320-283-10).

Step 2.

Check position of parking brake and trailer supply valves.

Position correctly.

(Refer to TM 9-2320-283-10).

Step 3.

Check intervehicle connections.

Connect air hoses correctly and open trailer supply valve.

Step 4.

Check for leakage at dual brake treadle valve using a soap solution.

Tighten connections or replace defective brake treadle valve (para 3-174).

Step 5.

Check brakes for proper adjustment and worn linings.

a. Adjust brakes (para 3-157).

b. Replace brakes shoes (para 3-159).

2-304