TM 5-3805-262-20
3-19. AIR BRAKE SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. AIR PRESSURE GAGE INDICATES LOW AIR PRESSURE (LOW AIR PRESSURE BUZZER NOT
SOUNDING) (Cont).
Step 2.
Touch wire lead disconnected in step 1 above to clean metal area of
c h a s s i s.
AIR PRESS gage should indicate in red zone (low air pressure).
a. If AIR PRESS gage indicates in red zone, replace
(page 5-136).
b. If AIR PRESS gage does not indicate in red zone,
in wire lead connected between gage and pressure
pressure sender
check for open
sender .
If wire lead is okay, remove instrument cluster (page 5-34) and
replace AIR PRESS gage (page 5-39).
3. LOW AIR PRESSURE (AIR PRESSURE GAGE INDICATES IN RED ZONE AND LOW AIR PRES-
SURE BUZZER SOUNDS).
Step 1.
Check that air reservoir drain valve is fully closed.
a . I f d r a i n v a l v e i s n o t f u l l y c l o s e d , c l o s e t i g h t l y.
b. If drain valve is fully closed, go to step 2 below.
Step 2.
Remove engine right side panels (page 9-14).
Check air compressor drive belt adjustment (page 7-97).
a. If air compressor drive belt is not adjusted properly, adjust
(page 7-97).
b. If air compressor drive belt is adjusted properly, go to step 3
below.
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