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Air Brake (Q Endorsement) Practice · Question

The brake system telltale light illuminates momentarily when you start the engine, then turns off. What does this indicate?

Many brake system warning lights perform a self-test when the engine is started, illuminating briefly to confirm the bulb is working before turning off. This is

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Question: The brake system telltale light illuminates momentarily when you start the engine, then turns off. What does this indicate?

Answer options: ✅ Normal operation and self-test of the brake system warning light.

  • A temporary malfunction in the brake system that has resolved itself.
  • The parking brake is still partially engaged.
  • Low fluid level in the hydraulic brake system (if equipped).

Correct answer: Normal operation and self-test of the brake system warning light.

Explanation: Many brake system warning lights perform a self-test when the engine is started, illuminating briefly to confirm the bulb is working before turning off. This is a normal and expected part of operation.

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