TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 3. Check quick-release valve (10).
With engine idling and parking brake released, listen for sounds of air escaping through air
intake stack (7).
a. If escaping air is present, replace quick-release valve (10) (para. 3-216).
b. If escaping air is not present, inspect line (9) between quick-release valve (10) and
doublecheck valve (8). If clogged, repair or replace line (9). If not clogged, replace
doublecheck valve (8) (para. 3-216).
WARNING
Loosen delivery line at valve very slowly. Stop procedure and
tighten fitting of delivery line the moment air begins to escape.
Injury to personnel may result if delivery line is accidentally
disconnected from valve.
Test 4. Check parking brake valve (4) delivery pressure (supply pressure confirmed in test 2). With
engine running and parking brake released, slowly loosen delivery line (6).
a. If escaping air is not present, adjust or replace parking brake valve (4) (para. 3-194).
b. If escaping air is present, spring brake diaphragms are defective. Notify DS
maintenance.
END OF TESTING!
2-211
