What causes wire backed linings to fail an inspection?

Wire backed linings are designed to provide durability and strength in braking systems. However, one significant reason they may fail an inspection is due to contamination or visible wires. When the linings become contaminated, it can severely affect their effectiveness. This contamination could be from oil, grease, or other substances that interfere with their ability to provide adequate friction.

Additionally, if the wires embedded in the linings are showing, this indicates that the linings have worn down excessively. The appearance of the wires suggests that the material has degraded to a point where it can no longer perform safely, compromising the braking function. Therefore, such conditions are critical in determining the safety and effectiveness of wire backed linings during an inspection, leading to a failure in the inspection process.