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Air Brake (Q Endorsement) Practice · Question

The first (supply / wet) reservoir is drained:

Daily draining is typical for trucks without an automatic drain valve, especially before cold weather.

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Question: The first (supply / wet) reservoir is drained:

Answer options:

  • Every year ✅ At intervals set by the manufacturer (often daily on systems without automatic drains)
  • Only at major service
  • Never

Correct answer: At intervals set by the manufacturer (often daily on systems without automatic drains)

Explanation: Daily draining is typical for trucks without an automatic drain valve, especially before cold weather.

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