It’s possible to expot brush to .3dm format ? :???:
sorry for my english 
well you can always convert it to ASE which if i understood that right can be imported in 3dmax and lightwave (and some others?) i didn’t do that yet though but talk to grizzlybear at www.wolfproject.net he seems to know this stuff
To import an ASE to 3ds max, you have to download a plugin… it was hard to find, but I think I posted a link to it a while back in this forum. I imagine searching will find it.
EDIT: Here:
http://www.splashdamage.com/forums/viewtopic.php?t=2355&highlight=import+ase