A trick I used with my MTs: once the system is 'full' rubber band the lever to bars so as to isolate the line and the calliper. Then create a vacuum using the lever syringe. Release / Pull / Release / Pull until no more bubbled or boredom sets in. Then release the elastic band.
Park tools tooling looks interesting:
https://www.youtube.com/watch?v=k91lB1zMhfk
A trick I used with my MTs: once the system is 'full' rubber band the lever to bars so as to isolate the line and the calliper. Then create a vacuum using the lever syringe. Release / Pull / Release / Pull until no more bubbled or boredom sets in. Then release the elastic band.