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TM 9-2320-270-20-1
AIRBRAKE SYSTEM
The air compressor supplies air to the air tanks. The air tanks send air to the treadle valve and the
relay valves. When the brake pedal is pushed down, the treadle valve opens and air is sent to the quick
release valve and the relay valves. Air from the quick release valve goes to the front axle air chamber
where it is used for stopping the front axle wheels. Air from the relay valves goes to the pusher axle and
tandem axle air chambers where it is used for stopping the pusher axle wheels (when in use) and the
tandem axle wheels. The relay valves also apply the tandem axle spring brakes when pressure in the
system is lost.
Air Compressor The air compressor is flange-mounted to the flywheel housing and gear driven by an
accessory drive attached to a camshaft gear. The air compressor runs continuously while the engine
is running. The actual compression of the air is controlled by the governor. The governor starts and
stops the compression of air by loading or unloading the compressor when the air pressure in the
system reaches the minimum or maximum pressure.
Air Tanks There are three air tanks in the airbrake system. The air tanks store air under pressure and
supply air to the brake system when needed.
Brake Pedal - Mounted on the cab floor, the brake pedal controls the air sent to the air system by the
treadle valve.
Treadle Valve The treadle valve has two separate supply and delivery circuits for service and
secondary braking. The treadle valve provides a graduated control for applying and releasing the
vehicle brakes.
TA239592
1-21

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