Virginia State Inspection Practice Test

What indicates that the wire in wire-backed linings is in a worn condition?

1. It is missing

2. It is visible in the friction surface

3. It is corroded

4. It has a rubber coating

The correct answer is: It is visible in the friction surface

The presence of wire in a wire-backed lining that is visible on the friction surface is an indicator that the lining has worn down significantly. When the friction material wears, it can reach the point where the wire braid becomes exposed. This visibility suggests that the lining has lost enough material to compromise its effectiveness, which can lead to reduced braking performance and possible safety issues. In terms of performance and safety, it's crucial for brake linings to maintain sufficient thickness of friction material. If the wire is visible, it serves as a clear visual cue that the component may need to be replaced to ensure safe vehicle operation. Monitoring the condition of brake linings is essential during vehicle inspections to prevent potential brake failure. The other aspects, such as missing wire, corrosion, or a rubber coating, do not serve as direct indicators of wear to the point of being a significant concern for performance. Therefore, only the visibility of wire on the friction surface specifically signals the critical condition of the wire-backed linings.