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TM 9-2320-312-10
TROUBLESHOOTING PROCEDURES
Table 1. Air System and Brakes Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Air Reservoir Pressure Low (LOW AIR
1. Check whether air reservoir
Close draincocks.
Warning Light and Buzzer are On).
draincocks are closed.
2. If vehicle is not coupled to a
Pull knob out (OFF).
trailer, check position of trailer
air supply control knob.
3. Notify Unit Maintenance.
2. Air System Loses Pressure During Vehicle
Operation or LOW AIR Warning Light and
Buzzer Come On During Vehicle Operation.
NOTE
Any change in pressure on brake pedal will cause a change in air pressure reading on gauge.
If leaks are present, notify Unit
1. Ensure  trailer  air  supply
Maintenance.
control knob is pulled out
(OFF). Operate engine until
warning light goes off and
release parking brake. Stop
engine and note reservoir
pressure. Fully press and hold
service brake pedal for two
minutes.
NOTE
Any change in pressure on brake pedal will cause a change in air pressure reading on gauge.
2. Push trailer air supply control
If air leaks are present, notify Unit
knob in (ON) to charge trailer
Maintenance.
air reservoirs and repeat step 1.
3. Trailer Brakes Will Not Apply When Brake
Check intervehicular air hoses for
Connect air hoses.
Pedal or Trailer Brake Control Valve Lever
proper connections to trailer.
on Instrument Panel is Used.

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