Generally yes - you need to be fit and agile enough to get access to the motor though...
Here's a vid of a guy in the UK changing brushes of a W/M - he does it on the bench - difficult to film inside the machine...
http://www.youtube.com/watch?v=0GmtRBiXLFc
Not all motor/brush arrangements are the same but the principle is identical on virtually all W/M motors.
Peccavi, March 2009
