What condition indicates a leak in hydraulic System B?

• A. The reservoir fluid level stabilizes at approximately 20% full
• B. The reservoir fluid level stabilizes at approximately 70% full
• C. The reservoir fluid level stabilizes at approximately 0% full
• D. The reservoir fluid level stabilizes at approximately 100% full

Answer: (C)

A leak in a hydraulic system can be indicated by the reservoir fluid level stabilizing at a very low point, which is around 0% full. When there is a leak, the fluid in the system escapes, and as a result, the fluid level in the reservoir will drop significantly. A reservoir that reaches a critically low level signifies that the system is not retaining the fluid necessary for proper operation, which can lead to inefficiencies, decreased pressure, and potential system failure.

The other options present fluid levels that either suggest stability in the system's operation or an adequate supply of hydraulic fluid. For example, a reservoir level stabilizing at 20% or 70% full may indicate that some fluid has been used, but not to an extent that would typically point to a significant leak. A full reservoir at 100% indicates that the system is functioning properly and has an adequate supply of fluid, further confirming that there is no leak. Therefore, the only logical indicator of a leak is when the fluid level stabilizes at 0%, as this reflects a loss of hydraulic fluid that would not occur under normal operating conditions.