I have just bought a KTM 640 adventure 2004, been in a shed for 7 years, no pressure at the front brake, same as you said, I can see the small hole, so I will clean blow out etc. before I looked in this forum I did try to bleed, vacuum method by pulling the fluid from the master to the bleed nipple, I got clean air free fluid, but still nothing at the lever. I will stick it back together tonight and try to bleed again.