DW716 20 DeWalt Miter Saw - How and When to Replace Brushes (Part # 614367-00)

http://mmtoolparts.com discusses what brushes do, how to know when to replace brushes and how to do it yourself. If your tool is experiencing intermittent power (sometimes it works, sometimes it doesn't) or decreased power, it's a good idea to inspect the brushes. 

Brush Part #614367-00

https://www.mmtoolparts.com/store/dewalt-brush-lead-614367-00