What is the purpose of the governor in an air brake system?

Answer: B — To maintain air pressure within the system

The role of the governor in an air brake system is crucial for maintaining air pressure within the system. This component automatically monitors the air pressure and controls the operation of the air compressor. When the pressure drops below a certain threshold, the governor signals the compressor to activate and build up the pressure needed for the brakes to function effectively. Once the desired pressure level is reached, the governor prevents further air from entering the system, maintaining optimal operating conditions for safe braking. This regulation of air pressure is essential because insufficient pressure can lead to brake failure or inadequate braking power, compromising vehicle safety. Therefore, the governor ensures that the air brake system operates within its designed specifications, providing reliable performance when stopping the vehicle.