Louisiana Class D Chauffeur's License Practice Test

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Prepare for the Louisiana Class D Chauffeur's License Test. Study with multiple choice questions and hints that help build your knowledge. Ensure success on your exam day!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What indication does the supply pressure gauge provide in the air brake system?

Temperature of the air system
Amount of air pressure in the tanks
Level of oil in the system
Distance traveled since last check

The correct answer is: Amount of air pressure in the tanks

The supply pressure gauge in the air brake system specifically indicates the amount of air pressure in the tanks. This gauge is a crucial component for drivers, as it allows them to monitor the air pressure levels necessary for the safe operation of air brakes. Maintaining an adequate level of air pressure is essential for the brakes to function properly, preventing brake failure and ensuring safe stopping distances. The air pressure in the tanks must reach a certain threshold before the brakes can effectively engage, which is why this gauge is so important. It alerts the driver to any potential issues with the air brake system, such as leaks or insufficient pressure, allowing for timely repairs and maintenance. Monitoring this gauge can prevent accidents caused by brake system malfunctions that might arise from low air pressure.