TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 7. Check limiting valve (3) for proper air delivery 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 delivery lines (6) and (4) and remove tee (5) from limiting valve (3).
Step 4. Connect test gauge to delivery port (2) of limiting valve (3).
Step 5. Direct assistant to start engine and allow air pressure to build to normal operating
pressure.
Step 6. Direct assistant to fully apply and hold service brakes.
Step 7. Check reading on test gauge.
a. If test gauge reads normal operating pressure, check air delivery lines (6) and (4) for
blockage. Repair or replace lines (6) and (4) as necessary (TM 9-243).
b. If pressure is below normal or nonexistent, stop engine, drain air, connect lines to
limiting valve (3), and proceed to test 8.
DRAINVALVE SEQUENCE
2-184
