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!

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What is the function of the automatic air tank drain in the air brake system?

It manually expels excess air
It automatically expels water and oil
It increases air pressure
It regulates air flow to the brakes

The correct answer is: It automatically expels water and oil

The automatic air tank drain serves a crucial function by automatically expelling water and oil that can accumulate in the air brake system. When air is compressed for use in the braking system, moisture and contaminants such as oil can condense and collect in the air tanks. If not removed, this moisture and oil can adversely affect the performance of the air brakes, leading to corrosion, reduced efficiency, and potential system failure. By automatically draining these contaminants, the system helps maintain optimal performance and ensures that the brakes work effectively. This automatic drainage feature is essential for the reliability of the brakes, especially in heavy-duty vehicles where air brake systems are common. Keeping the air tanks clean and free from moisture and oil is vital for driver safety and the longevity of the braking components.