Here's a carbon brush replacement video for a similar motor to the DC01 and other Dyson motors. http://www.youtube.com/watch?v=pO6IGz4JmtM
Carbon brushes for Dyson motors are also very cheap on ebay, under £3 with postage, search eBay or goggle with 'CARBON BRUSHES DC01' (or replace for DC02 etc), hope that helps. I'm just someone researching the replacement of mine and am not associated with any leads above.
John, February 2011