Before inspecting a brake system for leaks, what must be done?

Applying pressure to the brake system is essential before inspecting for leaks because it allows the system to be tested under operating conditions. When pressure is applied, any leaks that may exist will be more apparent. This is crucial for ensuring that all components are functioning correctly and can hold pressure. By doing so, inspectors can identify any irregularities, such as fluid seeping from seals or connections, which could indicate potential failures.

Conducting the inspection without first applying pressure could result in missing minor leaks that only manifest when the system is pressurized. It is also important to note that certain safety protocols require the system to be operationally tested to confirm that all parts are secure and functioning as intended.