When performing a jerk test, what must the AIR PRESS gauge indicate at a minimum?

In a jerk test, the AIR PRESS gauge must indicate a minimum of 100 psi. This threshold is established to ensure that the system maintains adequate pressure for efficient operation and safety during the test. The test aims to verify the integrity of the air brake system, and a pressure reading below this minimum could indicate potential issues that could affect performance, such as leaks or inadequate pressure needed to engage system components correctly. Ensuring that the gauge reflects at least 100 psi is crucial for conducting the test under safe conditions, providing reliable results that affirm the system’s readiness for operation.