CDL Air Brakes TestAir Brake System PartsEasy
What is the primary purpose of the supply pressure gauges in a commercial vehicle equipped with an air brake system?
- ATo measure the amount of air being used by the service brakes.
- BTo monitor the voltage of the air compressor's electrical circuit.
- CTo show the amount of air pressure available in the air tanks.
- DTo indicate the temperature of the compressed air.
Show answer & explanationAnswer & explanation
Correct answer: C. To show the amount of air pressure available in the air tanks.
Supply pressure gauges directly display the air pressure stored in the primary and secondary air tanks. This information is crucial for the driver to monitor the air brake system's health and ensure sufficient air is available for safe braking.
Why the other options are wrong
- A. While air is used by service brakes, the gauges show the supply, not the consumption rate.
- B. The air compressor's electrical circuit voltage is not monitored by air pressure gauges.
- D. Air temperature is not typically monitored by a dedicated gauge in the driver's cabin for air brakes.
Supply Pressure Gauges
Supply pressure gauges indicate the amount of compressed air available in the primary and secondary air tanks of an air brake system.
- Crucial for monitoring system health.
- Shows available air for braking.
- Usually one gauge for each air circuit (primary/secondary).
Memory trick: Gauges tell you what you've got, not what you've spent.