What must be monitored to check the air compressor governor cut in and cut out pressures?

To determine the cut-in and cut-out pressures of an air compressor governor, monitoring the air pressure gauge is essential. The air pressure gauge provides real-time readings of the air pressure within the brake system.

The cut-in pressure is the point at which the air compressor begins to function and builds air pressure in the system, while the cut-out pressure is the maximum pressure at which the compressor stops working. By observing the readings on the air pressure gauge, a driver can ascertain whether the governor is operating effectively and whether the air system is functioning correctly. This monitoring is crucial for safe vehicle operation, as improper air pressure can lead to brake failure or malfunction.

Monitoring other factors, such as the number of brake applications, the temperature of the air compressor, or the engine RPM, may contribute to understanding the overall condition of a vehicle's air brake system, but they do not specifically indicate the operational pressures of the air compressor governor.