The air compressor is controlled by the governor, controlling when air is pumped into the reservoirs. Around 125 pounds per square inch (psi) the governor will stop the compressor from pumping air. When the pressure drops to about 100 psi the compressor will cut-in and start pumping air again.
Source: www.wabco-auto.com
8. The Truck Air Brakes Reservoir
The reservoirs are used to hold the compressed air. Every model of truck can be different, the size and number of tanks will vary.
The tanks should be big enough to allow the vehicle to stop several times before going empty. This is a safety feature just in case there was a malfunction with the compressor.
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Water and oil can build up in the air tanks. This can be really bad for the truck air brakes.
The water can freeze up in the winter time, causing your truck air brakes to fail. This usually collects at the bottom of the reservoir. Fortunately the air tanks are equipped with drain valve. Be sure to drain the oil and water out completely.
Source: www.gobytrucknews.com
