All Big Dog's 1994-11 used DOT 5 Brake Fluid.  DOT 5 is a synthetic brake fluid designed to not damage the paint & it also does not absorb water during water storage.
NEVER mix DOT 5 with DOT 3 or the newer DOT 5.1 it will gum it and will be incredibly difficult to flush the system.
DOT 5 only!  That is what is in all our kits, should be a greenish tint to it out of the bottle.  It turns clear fairly quickly after running in the bike.