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TM 9-2320-360-20-1
WARNING
When working on parking brake control
system vehicle may roll. Vehicle must be
parked on level ground. Wheel chocks
must be positioned in front of and behind
one of the rear wheels to keep it from
rolling. Failure to comply may cause
serious injury or death to personnel.
NOTE
Refer to brake air hose diagram (in front
of this Troubleshooting section) for
service relay valve locations.
BRAKE SYSTEM VALVE
TEST
(1)
Push in parking brake control.
(2)
Check service brake relay valves
for air leaks, while assistant
presses on treadle valve.
(3)
Pull out parking brake valve.
NOTE
Air system pressure must be in the 90-
125 psi operating range to begin brake
system troubleshooting. If the air
pressure cannot be maintained within
operating range proceed to AIR SYSTEM
TROUBLESHOOTING.
Operate treadle valve while assistant observes the air
lines for audible noise or movement of the eight brake
chambers.
Change 1 2-727
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