Table 1. Air System and Brakes Troubleshooting Procedures.

TM 9-2320-312-10

TROUBLESHOOTING PROCEDURES

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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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