TM 9-2320-361-20 Table 2-3. Compressed Air and Brake System Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 12. LOW OR NO READING ON AIR PRESSURE GAGE AND WARNING BUZZER SHUTS OFF Test 1. Check air supply pressure to air pressure gage (1). 13. Step 1. Stop engine and open all draincocks (TM 9-2320-361-10) until brake system air pressure is vented. Step 2. Disconnect air supply line (2) from air pressure gage adapter (3). Step 3. Connect air supply line (2) to test gage (4). Step 4. Start engine (TM 9-2320-361-10) and allow air pressure to build to normal operating pressure. Step 5. Check test gage (4) reading. a. b. If reading is low or zero, check air supply line (2) for bends, kinks, or leaks. Repair or replace air supply line if bent, kinked, or leaking (para. 8-15). NOTE Air pressure gage on instrument panel has a maximum pressure scale of 120 psi. If old governor has been replaced with new governor, air pressure may exceed maximum pressure reading on instrument panel gage. If reading is above 85 psi (586 kPa) on test gage (4), replace air pressure gage (1) (para. 4-11). END OF TESTING! WARNING BUZZER FAILS TO SOUND ON LOW PRESSURE (BELOW 60 PSI) Refer to electrical troubleshooting table 2-4. 2-70