TM 9-2320-361-20 Table 2-3. Compressed Air and Brake System Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 3. Install adapter (7) in trailer brake supply hose (6). Step 4. Connect test gage (8) to adapter (7). Step 5. Direct assistant to start engine (TM 9-2320-361-10) and allow air supply to build to normal operating pressure. NOTE ● Service brake air pressure and airbrake hand control air pressure must not be checked at the same time. ● Air pressure must be held and maintained for pressure to equalize in air-hydraulic cylinder with air system pressure. Step 6. Direct assistant to fully apply and hold service brakes or pull down on trailer airbrake hand control (TM 9-2320-361-10). Step 7. Check test gage (8) reading and compare with reading on instrument panel gage. a. b. 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 lower than instrument panel gage reading, perform test 2. If reading compares with instrument panel gage, check trailer brake system for proper operation (TM 9-2320-213-14). Step 8. Reinstall quick-disconnect coupling (5). a. b. c. d. e. Disconnect test gage (8) from adapter (7). Remove adapter (7) from trailer brake supply hose (6). Install quick-disconnect coupling (5) to trailer brake supply hose (6). Close all airbrake valves (TM 9-2320-361-10). Start engine (TM 9-2320-361-10) and ensure airbrake system pressurizes to normal operating pressure 2-63