[Terry M. Hunt]

I've known about arcing shoes for many years, but never had it done on any of the brake jobs I performed on 5 different cars. Did some web surfing today on the subject and saw a couple of videos of different brand machines doing this process. I can understand how this would produce ideal contact between shoe and drum, but wouldn't the shoes wear into this same ideal contact pattern over time anyway? Any guess about how long it would take for this to occur?