What failure condition is indicated for a hydraulic power booster?

A fluid leak is a significant failure condition indicated for a hydraulic power booster. The hydraulic power booster relies on pressurized fluid to assist with braking force, and any leak can compromise this pressure. If there is a fluid leak, it could lead to insufficient hydraulic pressure, resulting in poor braking performance, which is a critical safety concern. Detecting such a condition is essential during safety inspections, as it can directly affect the vehicle's ability to stop effectively.

In contrast, the other options suggest normal operation or functionality. The presence of hardware that is intact, absence of air in the system, and operational components would indicate that the hydraulic system is functioning as intended, which does not signify a failure condition. In summary, identifying a fluid leak emphasizes the importance of maintaining the integrity of the hydraulic system for safe vehicle operation.