TM 5-3805-262-203-19. AIR BRAKE SYSTEM TROUBLESHOOTING (CONT)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION3. LOW AIR PRESSURE (AIR PRESSURRE GAGE INDICATES IN RED ZONE AND LOW AIR PRES-SURE BUZZER SOUNDS ) (Cont).Step 3 .Check air compressor governor adjustment (page 7-100).a. If governor doesn’t cut out at 105-115 psi or cut in at 90-95p s i , r e p l a c e i t ( p a g e 7 - 9 8 ).b. If governor adjustment is okay, go to step 4 below.Step 4.Perform governor test (page 7-101).a. If governor does not test okay, replace governor (page 7-98) andforward it to direct support maintenance for repairs (inlet-ex-haust valve, 0-ring around bottom of piston, piston, exhauststem, or governor body must be checked for damage).b. If governor tests okay, go to step 5 below.Step 5.Drain air from air reservoir by opening drain valve located at bot-t o m o f a i r r e s e r v o i r .Remove safety valve located at top of air reservoir.Connect an adapter to an air hose connected to a regulated air sup-ply capable of supplying up to 160 psi air pressure.Connect safety valve to adapter.Apply air pressure to safety valve; safety valve shall vent air whenpressure reaches approximately 150 psi.a. Replace safety valve if it vents air below 145 psi (page 7-58).3-122b. If safety valve checks okay, reinstall it, and go to step 6 be-low.
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