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During your CDL pre-trip inspection, the governor must be tested. Watch the video to learn how!

On an air brake equipped vehicle, the compressor pumps air the entire time the motor is running. The governor controls the compressor. The governor puts the compressor into the load (cut-in) and unload (cut-out) phase. It’s like a thermostat on a furnace. When the temperature in the house reaches a minimum, the thermostat turns the furnace on; and when the temperature in the house reaches a maximum, the thermostat turns the furnace off. Like the thermostat that controls the furnace within a temperature range, the governor controls the compressor within a pressure range – often between 100 (670kPa) and 135psi (930kPa). When the pressure reaches a minimum, the governor directs the air from the compressor into the system (load phase); when the system reaches a maximum air pressure, the governor directs the air pressure into the atmosphere (unload phase). The governor is nothing more than an on/off switch that works within a range.
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