Hello all, I have a motor on a Panasonic vacuum where the one of the carbon brushes is arcing badly on one side but the other side is perfectly fine and does not arc. Would I have to replace the brush, or use a sanding stone. This is for work and I do not want to mess this up.
Post# 397882 , Reply# 1   9/7/2018 at 17:25 (2,049 days old) by Lesinutah(Utah)  
Before replacing brushes, see if you can measure current draw with a 'kill a watt' device or ammeter. If much above rated current draw then motor is failing with shorting windings.