I installed new front Brake Lines today. I have a Shop Manual and a Mighty-Vac. The Shop Manual said to bleed the Master Cylinder first, then go to the Calibers. I used a Pint of fluid and still no lever firmness. I came into the house and used our site Search and found HUB's recommendation-BINGO!
These type radial masters are common doing this so there is a nipple at the top of the master. Use a closed end 8mm wrench, a paper towel on top of the nipple; open nipple; pull lever to grip; close nipple before you touch the grip. If not once then twice is the charm the lever comes back.
This should be a STICKY.
Do the M/C bleeder LAST.
Thanks HUB!