Air from the compressor is stored in air tanks.
Located under or around the frame of the vehicle, these tanks are usually made of steel and shaped like
cylinders with domed ends.
One, two, three or more tanks may be used, depending on the specific needs of the vehicle.
In some cases, two tanks are
housed within one cylinder using an internal separator that is not visible from the outside.
The air that is drawn in by the air compressor contains moisture or humidity.
As the air is compressed and passed into the tanks, the
moisture condenses or “drops out” of the air and settles to the bottom of the tank.
Oil used to lubricate the air compressor may also mix with the
air that passes through the compressor and settles at the bottom of the tank.
Your air tanks should be drained Once a day.
Key points to remember.
Compressed air is a form of stored energy that can be hazardous.
Air compressors compress air by forcing it into a smaller
Air compressors are powered directly by the engine or by using belts and pulleys.
Air compressors are mounted directly on the engine or by
brackets and fasteners.
The governor controls the air compressor cut-in and cut-out pressure.
Compressed air is stored in the vehicle’s supply or "wet" tank and the dual service (primary and secondary) air tanks. To prevent too much
moisture and oil from collecting, the air tanks must be drained regularly.
Air pressure gauges indicate air pressure in the vehicle’s dual service
(primary and secondary) air tanks.
Safety valves prevent over-pressure of the air brake system.
Low air pressure warning devices give drivers a
visual, and sometimes audible, warning that air-pressure is dangerously low.
An air dryer removes moisture from the air brake system and expels it when
the compressor reaches cut-out pressure.
An alcohol evaporator adds alcohol vapor to the air brake system to help prevent moisture in the system