Illinois CDL Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The function of the governor in an air brake system is to maintain optimal air pressure within the system. The governor acts as a control mechanism that monitors the air pressure level and regulates it by engaging and disengaging the compressor as needed. This ensures that the air brake system has a sufficient supply of compressed air for operation without exceeding the maximum pressure limits, which could lead to malfunction or safety issues. Maintaining this balance is crucial for the effective performance of the air brakes, allowing for reliable and safe braking at all times.

The other options do not accurately describe the primary role of the governor. For instance, while enhancing braking power might seem desirable, that function is primarily determined by the overall design of the braking system rather than the governor. Adjusting brake release time is more related to the control valves and other components in the system, and the lowering of brake temperature isn't a direct function of the governor but rather a result of proper operation and maintenance of the braking system as a whole.