Practice Quiz

Commercial Driver's License

Category - Standard Driving

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When drivers need to remove water and oil from the air brake system, they should use the:
  1. Safety valve
  2. Air tank drain
  3. Treadle valve
  4. Alcohol evaporator
Explanation
Answer: B - In order to drain oil and water from the air tanks drivers must use the air tank drain. The alcohol evaporator forces alcohol into the air system in order to help reduce the risk of ice forming during cold weather. The safety valve is used to protect the tank and system from gaining too much air pressure. A treadle valve is another name for the brake pedal.
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