Louisiana Class D Chauffeur's License Test 2025 – 400 Free Practice Questions to Pass the Exam

The air compressor governor is the component that controls when the air compressor will pump air into the storage tanks. It monitors the pressure within the system and ensures that the air compressor engages and disengages based on the pressure levels.

When the pressure in the storage tanks drops below a certain threshold, the governor signals the air compressor to start pumping air into the tanks to replenish them. Once the pressure reaches a specified upper limit, the governor will then deactivate the compressor to prevent over-pressurization of the tanks. This automatic regulation is crucial for maintaining appropriate air pressure for the braking system and other functions that rely on compressed air.

The other options do not serve this specific control function. A manual air tank drain is primarily used for removing moisture from the tanks, the safety valve is designed to protect against overpressure situations, and the application pressure gauge indicates the pressure being used in the braking system rather than controlling the operation of the compressor.