I take it the fluid is coming out of the ABS reservoir cap, in which case pressure bleeding the system won't help, they are separate systems
if the solnoids/ABS hasn't been exercised for some time, they might be stuck, and will need energising a few times to see if they can free themselves....
try this...
http://danoland.com/nsxgarage/brakes/abs/abs.htm
you don't necessarily need the maintenance bleeder to do it, but measuring the volume of fluid that is released will give an indication of the accumulators condition. if you are a competent mechanic, it can be done with a 9mm cranked 12 point spanner and a tube to a container on the bleed nipple 'maintenance bleeder' but BE VERY CAREFUL as it's under high pressure. if in doubt energising the solenoids releases the pressure anyway....