TM-9-2320-285-24-1

TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1

TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1985

TM-9-2320-285-24-1 - Page 553 of 987

TM 9-2320-285-24-1

2-46.

SERVICE BRAKE SYSTEM TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

12.

REAR AXLE BRAKES FROZEN OR LOCKED (Cont)

Step 3.

Remove rear axle brakes air chambers (para 2-51d(2)).

Remove brake drums (para 2-44b).

Disassemble rear axle brakes (para 2-50b) and check slack adjuster,

camshaft, and associated parts for damage or wear.

If parts are damaged or worn, replace (para 2-50b).

13.

INSUFFICIENT BRAKE FORCE TO STOP VEHICLE (FRONT AXLE BRAKES)

Step 1.

Remove brake drums (para 2-44a).

Check brake shoe linings for excessive wear (worn to depth of groove at side of lining).

a.

If brake shoe linings are excessively worn, replace brake shoes (para 2-50a).

b.

If brake shoe linings are okay, go to step 2 below.

Step 2.

Check brake shoe linings for grease or dirt contamination.

a.

If brake shoe linings are contaminated, replace brake shoes (para 2-50a).

b.

If brake shoe linings are not contaminated, go to step 3 below.

Step 3.

Disassemble front axle brakes (para 2-50a) and check plungers for damage.

a.

If plungers are damaged, replace (para 2-50a).

b.

If plungers are not damaged, go to step 4 below.

Step 4.

Check front axle brakes air chambers for damage.

a.

If front axle brakes air chambers are damaged, repair (para 2-51d(1)).

b.

If front axle brakes air chambers are okay, go to step 5 below.

Step 5.

Check air brake system lines and fittings for air leaks.

a.

If lines or fittings are leaking air, repair or replace (para 2-51a).

b.

If lines and fittings are okay, refer to Malfunction 5 above.

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