There's a video on Youtube that shows you.
They remain stationary and fixed to the outer shell of the motor - pointing inwards towards the axial of the rotating piece - 180 degrees apart from one another and often in a plastic outer case - they will have a wire running to each of them.
The look a bit like this...
http://shop.ukwhitegoods.co.uk/images/sole_motor_carbon_brushes_washing_machine_washer_dryer-2.jpg
Peccavi, July 2010
