TM 5-3805-262-203-19. AIR BRAKE SYSTEM TROUBLESHOOTING (CONT) MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION3. LOW AIR PRESSURE (AIR PRESSURE GAGE INDICATES IN RED ZONE AND LOW AIR PRES-SURE BUZZER SOUNDS) (Cont).Step 9.Shut off engine. Open air reservoir drain valve and drain air.Disconnect hose shown below and install 3/8 NPT pipe cap on adapterto which hose was connected. Close drain valve.Start engine and operate at 1000 rpm.See if air pressure is now normal.Shut off engine..a. If air pressure is normal, open air reservoir drain valve todrain air, remove 3/8 NPT pipe cap, reconnect hose, close drainvalve, and go to step 10 below.b. If air pressure still is low, problem is in air compressor.Replace air compressor (page 7-88).Step 10. Open air reservoir drain valve and drain air.Open front access door.Loosen and disconnect hose fitting from elbow installed in pressurep r o t e c t i o n v a l v e .Install a 9/16-18 pipe plug in hose fitting and tighten securely.Close air reservoir drain valve.Start engine and operate at 1000 rpm.See if air pressure is now normal.Shut off engine.3-124
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