Air Brake Practice Test

The governor is a critical component in the air brake system that regulates the air pressure before it enters the brake system. It functions by controlling the compressor's operation to maintain the desired air pressure within the system. When the air pressure drops below a preset level, the governor signals the compressor to start building pressure. Once the pressure reaches the desired level, the governor will stop the compressor from operating to prevent over-pressurization. This regulation ensures that the brake system has sufficient air pressure to function effectively while also preventing potential damage caused by excessive pressure. Proper management of the air pressure is essential for the reliability and safety of the braking system in heavy vehicles. The other components mentioned have specific roles but do not perform the task of regulating air pressure for the entire brake system.