Michigan CDL - Air Brakes Practice Exam

The primary function of the governor in an air brake system is to regulate air pressure and control compressor operation. The governor automatically manages the air pressure produced by the compressor, ensuring that it remains within optimal limits for the braking system to function effectively. When the pressure drops below a preset level, the governor activates the compressor to recharge the air tanks. Conversely, when the pressure reaches a designated maximum, the governor prevents the compressor from continuing to supply air, which helps protect the system from over-pressurization. This regulation is vital for maintaining the integrity of the air brake system, ensuring that brakes respond properly and safely during operation. Other roles, like controlling the vehicle’s speed, providing emergency braking, or monitoring fuel efficiency, are associated with other systems or components rather than the specific function of the governor in the context of air brakes.