Get 4 clear plastic bottles and 4 hoses. Fill reservoir, leave cap off, attach hoses to brake cylinders/calipers. Open bleed screws. Check the reservoir every so often and add fluid. Do not let reservoir run dry or you'll have to start over again. Might take a day or more for all the air to migrate up and fluid down. I did this on an Alfa Giulietta that had tons of air in the lines.I hate to admit it but I’ve been doing this for a long time and I’ve never heard of gravity feed. (as related to brakes) but I see it’s a thing. Never too old to learn. Not sure it would get rid of all the air as well as pressure bleeding but in either case she comes home tonight so I’ll go with tried and true tomorrow.
lots of Ytube videos