TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 8. Check limiting valve (3) for proper air supply pressure (front service brake chambers test
low or nonexistent air pressure).
Step 1. Stop engine and open all drainvalves (1), in sequence shown, until brake system air
pressure is vented.
Step 2. Close drainvalves (1).
Step 3. Disconnect air supply line (7) from limiting valve (3).
Step 4. Connect test gauge to air supply line (7).
Step 5. Direct assistant to start engine and allow air pressure to built to normal operating
pressure.
Step 6. Check reading on test gauge.
a. If test gauge reads normal operating pressure, replace defective limiting valve (3)
b. If pressure is below normal or nonexistent, check air supply line (7) for blockage.
Repair or replace as necessary. If no blockage is present, stop engine, drain air,
remove test gauge, connect air supply line (7), and proceed to test 9.
DRAINVALVE SEQUENCE
2-185
