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Air Brake (Q Endorsement) Practice · Question

What is the typical visual indication on the dashboard when the trailer's parking brakes are applied?

When the trailer's parking brakes are applied, the red octagonal trailer air supply valve is typically pushed in, often illuminating a red warning light to visu

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Question: What is the typical visual indication on the dashboard when the trailer's parking brakes are applied?

Answer options: ✅ The red trailer air supply valve is pushed in, revealing a red warning light.

  • The yellow trailer service brake valve is pulled out.
  • A green light on the dashboard illuminates.
  • The ABS warning light for the trailer turns on.

Correct answer: The red trailer air supply valve is pushed in, revealing a red warning light.

Explanation: When the trailer's parking brakes are applied, the red octagonal trailer air supply valve is typically pushed in, often illuminating a red warning light to visually confirm the activation of the trailer's spring brakes.

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