SPRING BRAKES WILL NOT APPLY-continued

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cent)

2-15. TROUBLESHOOTING INSTRUCTIONS

2-9. Troubleshooting (Cent)

Malfunction

Test or Inspection

Corrective Action

DUAL AIR BRAKE SYSTEM

5. SPRING BRAKES WILL NOT APPLY

SPRING BRAKE

AIR LINE

PARKING

BRAKE

VALVE

LINE

LINE

NO. 622

NO. 612

TA357242

Step 3.

Apply spring brakes. Disconnect line No. 612 at parking brake valve. Listen for air

escaping.

If air escapes, replace defective parking brake valve (para 11-20).

Apply spring brakes. Disconnect line No. 622 at spring brake control valve. Listen for air

Step 4.

escaping.

If air escapes, replace

spring brake control valve (para 11-17).

Apply spring brakes. Loosen spring brake air line on brake chamber.

Step 5.

If air escapes out of air line, replace defective spring brake relay valve

11-13).

If no air escapes, check for binding slack adjusters or damaged brake chamber,

repair or replace components as required.

2-170