I also had 0 rear brake. Bled front and rear with almost no air, went for a quick jaunt to warm up for an oil change; STILL no rear brake.
Pulled off the caliper and positioned it on the swingarm with bleed valve straight up...... SO MUCH AIR!!!!!
Had to cycle through 6-7 times to get it clean (and keep filling the thimble of a reservoir. LOL) Now I've got full-stop worthy rear brake again. Thanks to those that have reco'd this fix!