What is the function of the air brake governor?

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Prepare for the California Class B Driving Test with multiple choice questions, study guides, hints, and explanations. Ensure you're ready to ace your exam and start driving on California roads!

Multiple Choice

What is the function of the air brake governor?

Explanation:
The air brake governor keeps the brake system’s air pressure within a safe operating range by controlling the compressor. When the system pressure falls to the lower limit, the governor signals the compressor to start pumping air. When it rises to the upper limit, it stops the compressor to prevent over-pressurization. This on-off cycling maintains a ready supply of compressed air for braking and for other air-powered components, ensuring brakes work reliably even during heavy use or long descents. It isn’t involved in cabin air filtration, steering, or engine idle control, which are separate systems.

The air brake governor keeps the brake system’s air pressure within a safe operating range by controlling the compressor. When the system pressure falls to the lower limit, the governor signals the compressor to start pumping air. When it rises to the upper limit, it stops the compressor to prevent over-pressurization. This on-off cycling maintains a ready supply of compressed air for braking and for other air-powered components, ensuring brakes work reliably even during heavy use or long descents. It isn’t involved in cabin air filtration, steering, or engine idle control, which are separate systems.

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