Which brake issue involves a visible sign of damage during inspection?

A visible leakage in any part of the brake system is a critical issue that must be identified during an inspection because it poses a significant safety risk. Brake fluid is essential for the proper operation of the hydraulic braking system, and any leakage can lead to reduced braking efficiency or complete brake failure. During an inspection, the inspector should look for signs of fluid dripping or pooling underneath the vehicle, as well as any wetness around the brake lines, calipers, or master cylinder. The discovery of any leaks requires immediate attention and repair to ensure that the vehicle operates safely.

In contrast, while issues such as pedal height problems, brake lever alignment, and discoloration of brake pads might also indicate problems with the brake system, they do not present the same immediate visual signs of damage that leakage does. Such problems may affect the performance and effectiveness of the braking system but typically require more in-depth assessments rather than being readily observable signs of a critical issue.