Michigan CDL - Air Brakes Practice Exam

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Prepare for the Michigan CDL Air Brakes Test with our comprehensive quiz. Utilize flashcards and multiple choice questions featuring hints and detailed explanations. Ace your exam with ease!

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At what pressure should the low air pressure warning signal activate in an air brake system?

  1. 70 psi

  2. 60 psi

  3. 80 psi

  4. 50 psi

The correct answer is: 60 psi

The correct pressure at which the low air pressure warning signal activates in an air brake system is 60 psi. This threshold is critical for ensuring that the driver is alerted to a potentially unsafe condition. The air brake system relies on adequate air pressure to function properly; if the pressure drops below this level, it indicates that the air supply might be insufficient to operate the brakes effectively. Activating the warning signal at 60 psi allows the driver to take immediate action, such as reducing speed or finding a safe place to stop, before a complete loss of braking power occurs. Maintaining the air pressure above this threshold is essential for safe vehicle operation and helps prevent brake failure, which could lead to accidents.

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