Odd Repetitive Trouble with my Alpenlite brakes

I wish my assemblies were so cheap but they are close to two hundred fifty dollars a piece. They are very large. We are redoing all the wiring and did check voltage at each magnet. That's how we found the bad one. The bad magnet was on the same axle as the hub that eats brake linings. I did just begin to wonder that if that magnet has been bad four years could that cause the first failure?