Which application are you talikg about and on which OS ?
Post the question on that specific product forums for better answer.
Photoshop CS4 to CS6. Mac OS X 10.6.8
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MOVING THE DISCUSSION TO PHOTOSHOP FORUM
Hello, if you made sure to save the brushes (If they appear on the list does not mean that they are properly saved on your hard disk. To do so, launch edit>preset manager and save all the new brushes) to their default location, you'll be able to use the CS6 migration script.
see: for more info: http://forums.adobe.com/message/4287533