What type of brake lining is unacceptable if it shows uneven wear?

Uneven wear on brake linings can signify issues with either the brake components themselves or how the brakes are functioning. Wire-backed linings are designed to provide enhanced strength and performance, especially under high-stress conditions. However, if they exhibit uneven wear, it is a clear indication that there is a significant problem, such as misalignment, improper installation, or issues with other brake system components like calipers and rotors.

This type of wear can lead to poor braking performance and compromises the safety of the vehicle. Therefore, any wire-backed lining showing uneven wear would be deemed unacceptable, as the integrity needed for optimal brake function would be compromised. The other types of linings listed may have specific advantages or downsides, but the emphasis on performance and safety makes wire-backed linings particularly sensitive to uneven wear issues.