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Ontario Air Brake Practice · Question

Why is it important to regularly drain the air tanks, especially the wet tank, in an air brake system?

Compressed air contains moisture and oil vapour, which condense into liquid in the air tanks. If not drained, this water can freeze in cold weather, causing bra

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Question: Why is it important to regularly drain the air tanks, especially the wet tank, in an air brake system?

Answer options:

  • To prevent the air compressor from overheating. ✅ To remove accumulated moisture and oil that can freeze or corrode components.
  • To increase the overall air pressure capacity of the system.
  • To lubricate the internal components of the air dryer.

Correct answer: To remove accumulated moisture and oil that can freeze or corrode components.

Explanation: Compressed air contains moisture and oil vapour, which condense into liquid in the air tanks. If not drained, this water can freeze in cold weather, causing brake failures, and oil can contaminate valves and seals, leading to premature wear and failure.

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