I had to remove a master cylinder fitting yesterday, so air was introduced into the system.
I bled the right brake system as previously detailed.
I bled the left system as previously detailed.
This time, I drew a moderate vacuum and just waited. It took some time but almost all the bubbles disappeared. I think I still have a small amount of air in the right system. I will let it sit overnight and repeat tomorrow, as well as check the replaced fitting for leaks.
