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Air Brake (Q Endorsement) Practice · Question

Scenario 19: An emergency application of the trailer brakes happens automatically when:

Loss of supply-line pressure triggers an automatic emergency application of trailer brakes via the relay/emergency valve. The correct answer is "The emergency (

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Question: Scenario 19: An emergency application of the trailer brakes happens automatically when:

Answer options:

  • Engine RPM is too high ✅ The emergency (supply) line loses pressure (e.g., line break or disconnected glad-hand)
  • The driver shifts gears
  • Headlights are turned on

Correct answer: The emergency (supply) line loses pressure (e.g., line break or disconnected glad-hand)

Explanation: Loss of supply-line pressure triggers an automatic emergency application of trailer brakes via the relay/emergency valve. The correct answer is "The emergency (supply) line loses pressure (e.g., line break or disconnected glad-hand)". This capacity-fill scenario 19 reinforces the same competency for the airbrake bank and follows the certified explanation standard.

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