Got it, and thanks for the advice. What I suspect is happening is the shoes are still not adjusted well so the fluid has to travel more to make good contact, in the process having to borrow some fluid from the MC. Is this possible? Can it happen even if there is no air in the system? I’ll drive it and adjust again, I’m hoping I won’t have to re-bleed but it’s fine if I have to, getting a hang of it.I think you’re close. I’d put the wheels back on and head to a large empty parking lot and do some hard braking excursions. Then put back on stands and recheck tightness of each wheel (fair bit of drag then back off a click or two) and rebleed. It’s a pain, but once set you’ll be good to go. GL.
Update: adjusted the shoes before bleeding again, they were way way off. Now I’m gonna attempt to bleed.
In terms of getting the air out of the lines and system, isn’t it better if the shoes are not in contacts with the drum? That way they travel more and push the air out. What is the intuition behind adjusting shoes/cylinder before bleeding? I understand that if the shoes are close to the drums they are required to travel less so therefore more effective brakes, but I still haven’t understood the logic behind doing it before bleeding. Doesn’t mean I don’t listen to you guys though.
I finally understood, thank you!! Clearly explained and it makes perfect sense. Having the correct intuition will help me get it right."isn’t it better if the shoes are not in contacts with the drum?"
Absolutely not! It's best to have the shoes up tight against the drums BEFORE you attempt to bleed. If the shoes don't travel, you are compressing the air in the lines and cylinders the moment you push on the brake pedal. The compressed air then is forced out when you open the bleeder screw, which you close THE INSTANT fluid stop flowing from the bleeder.
Once you have a hard pedal AFTER bleeding, then you back off the adjusters to leave a slight drag on the drum by the shoe
Also, I have six bleeder screws on my '73, since the rear brakes have a jumper tube from the rear cylinders to the front cylinders, leaving only one bleeder on each side of the rear axle.