What is an acceptable distance for the separation of the brake lining if it is firmly attached to the shoe?

The acceptable distance for the separation of the brake lining when it is firmly attached to the shoe is typically 1/16". This standard is critical for ensuring optimal performance of the braking system. A distance of 1/16" allows for proper brake engagement while minimizing the risk of excessive wear or drag that can occur with larger gaps.

Brake linings that are too far away from the drum or disc might lead to reduced braking efficiency, as the effective contact area is diminished, causing longer stopping distances and potentially compromising safety. Conversely, a lining that is too close can lead to premature wear and overheating due to constant contact.

This standard reflects the balance necessary for effective braking performance, durability of the components, and safety retention in the system's design, making 1/16" the optimal choice in this scenario.