Practice question

Why is it mandatory to drain moisture and oil from the air reservoirs (tanks) of a heavy vehicle air brake system daily?

  1. To reduce the weight of the vehicle
  2. To prevent water and oil from causing brake failure or freezing in valves
  3. To increase the air pressure capacity of the tank
  4. To lubricate the brake drums

Answer: B — To prevent water and oil from causing brake failure or freezing in valves

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