I used a mighty vac at the bleeders and fought recurring air bubbles, so
instead of sucking the fluid down to the bleeders, I changed to an oil can
and connected a tube from the snout of the can to the bleed valve. Leave the
fill cap off the master cyl or reservoir and wrap it with a rag or have
somebody watch for the fluid to appear and start pumping from the bottom up.
Easy as falling off a cliff and excellent braking!!

Greg T