TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 266 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cent)

lalde 2-9. Troubleshooting (Cent)

tialfunction

Test or Inspection

Corrective Action

DUAL AIR BRAKE SYSTEM (CONT)

?. FRONT AXLE PARKING BRAKES WILL NOT APPLY (M984E1 ).

N

E

RELAY VALVE

AUXILIARY FRONT BRAKE VALVE ,.

.,61,6

Step 1. Remove cover from auxiliary front brake valve (para 11-21.2). Check air line 536A from

auxiliary front brake valve to service brake relay valve for breaks, kinks, or leaks.

Tighten or replace damaged or leaking line.

Step 2. Apply front axle brakes (TM 9-2320-279-10). Loosen line 788 at inversion valve.

If no air comes out of inversion valve, replace inversion valve (para 11-2 1.2].

Step 3. Apply front axle brakes (TM 9-2320-279-10). Loosen line 789 at air brake valve.

If no air comes out of air brake valve, replace air brake valve (para 11-2 1.2).

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