When was the fluid last changed?
It should be done every 2 years on aroad bike.
If that's been done recently then the next thing to do costs nothing but one cable tie & 12 hours.
Pull the front brake on hard.
Fix the lever in place with a cable tie nice & tight & leave overnight.
Cut cable tie.
Apparently the constant pressure forces any minute bubbles out!
It works...
Try it
[Edited on 6-8-2005 by Rushjob]