06-07-2005, 01:53 AM
When the motor stops working. I once wore a set of brushes down to less than a 1/8 inch they where still working. It was a nub with a shunt 
I have some pictures of the brushes if anybody wants to see.
Now a days if I see them get to a 1/4 or so long I replace them.
I have some pictures of the brushes if anybody wants to see.Now a days if I see them get to a 1/4 or so long I replace them.