Georgia Commercial Driver License Practice Test

How can you test your hydraulic brake systems for leaks?

1. By pumping the brake five times

2. By pumping the brake three times

3. By releasing the parking brake

4. By holding the brake pedal for two seconds

The correct answer is: By pumping the brake three times

To test hydraulic brake systems for leaks, one effective method is to pump the brake pedal several times to build up pressure, and then observe if the pedal sinks. If the pedal sinks slowly, this indicates that there might be a leak in the hydraulic system. Specifically, pumping the brake three times creates enough pressure to help identify a potential issue. The practice of pumping the brake pedal allows the driver to assess the responsiveness and strength of the brakes. If leaks are present, the brake pedal will not hold its position under sustained pressure, which serves as an indicator of a compromised hydraulic system. This method is crucial for ensuring the safety and reliability of the brake system. Other choices either do not effectively test for leaks or may not indicate issues reliably. For instance, releasing the parking brake or holding the brake pedal for a short duration does not provide the necessary evaluation of the hydraulic pressure that may reveal leaks.