Soooo….. I think i have solved the mystery of the falling Side Brush, the solution is…. Get a new brush motor module??? Yep. They are just 14.99 on: http://store.irobot.com/default/parts-and-accessories/roomba-accessories/700-series/sidebrush-module/83001.html#prefn1=productAgentOnly&sz=12&start=19&prefv1=false .
-Mr. Cave
thefinkedfilmsdotcom 