What sign may indicate issues with brake lines during a vehicle inspection?

The presence of visible wear, leaks, or rust on brake lines is a significant indicator of potential issues during a vehicle inspection. Brake lines play a critical role in the vehicle's braking system, transporting brake fluid under pressure from the master cylinder to the brake components. Any visible damage, such as wear or rust, can compromise the integrity of the brake lines, which may lead to brake fluid leaks. A leak in the brake line can lead to a reduction in brake fluid pressure, ultimately impairing the vehicle's ability to stop effectively, posing a serious safety risk.

Additionally, signs of wear or rust suggest the lines may be corroded or weakened, increasing the chances of line failure. Inspectors are trained to look for these signs during a pre-trip vehicle inspection to ensure that all components of the braking system are functioning correctly and safely.