To do it right, you need to bench bleed the master.

1. Secure the master cyl in a bench vise.
2. Install lines from the kit making sure they're always submerged in fluid.
3. Use a blunt and long phillips head screw driver and slowly depress the plunger until all bubbles are gone.

This should take you a while to do. If you do it in 3 minutes, you're doing it wrong and should spend more time.