California CDL Class A 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is the function of the governor in an air brake system?

To increase engine speed

To automatically regulate air pressure within the brake system

The function of the governor in an air brake system is to automatically regulate air pressure within the brake system. The governor plays a crucial role in ensuring that the air tanks maintain the proper pressure needed for the brakes to function effectively. It monitors the air pressure levels and triggers the compressor to fill the air tanks when the pressure drops below a specified level. This regulation is essential for maintaining the brake system's performance, allowing for reliable braking when needed.

By keeping the air pressure within a specific range, the governor helps prevent situations where the brakes might not function properly due to insufficient air pressure. This function is vital for safety, as it ensures that the braking system remains fully operational, especially in heavy-duty vehicles that rely on air brakes for stopping power.

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To control fuel supply

To initiate the vehicle’s ignition

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