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Ontario Air Brake Practice · Question

After connecting a trailer, what do two constant warning lights on the red and yellow push/pull valves on the dashboard most likely indicate?

Two constant warning lights (telltales) on the 'trailer air supply' (red) and 'trailer service brake' (yellow) valves usually signal an issue with the trailer's

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Question: After connecting a trailer, what do two constant warning lights on the red and yellow push/pull valves on the dashboard most likely indicate?

Answer options: ✅ Improper connection or a fault in the trailer's air brake system.

  • The trailer's service brakes are currently applied.
  • The light bulbs for the warning system are faulty.
  • The air pressure in the trailer's secondary tank is too high.

Correct answer: Improper connection or a fault in the trailer's air brake system.

Explanation: Two constant warning lights (telltales) on the 'trailer air supply' (red) and 'trailer service brake' (yellow) valves usually signal an issue with the trailer's air brake system or its connection. It prompts the driver to investigate a potential leak or component failure.

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