Getting brakes to work, no fluid emerging from rear lines and pedal very sticky Options

[Tking327]

Good Morn

I (a relative novice) replaced brake fluid supply lines from reservoir and master cylinder with new ones on my 1970 914-4 (also, unrelated to my question as yet, rebuilt all 4 calipers using autoatlanta kit and replaced front supply hoses). First step--Left metal supply lines unconnected from calipers and used pedal to flush lines of any crud (there was quite a bit of blackness that emerged from front after decades sitting, good), but no fluid at all ever came out of back supply lines after like 40 pumps of pedal, why? I reconnected front lines to calipers; same outcome, no fluid emerging from back lines and pedal goes all he way to floor. Connected all 4 lines to calipers. Pedal still goes to floor. No fluid leaks apparent anywhere. Should i now bleed the front then see if pedal at least does not go to floor anymore?

Also, a different issue- pedal extremely sticky, does not return on its own, you have to pull it back up. WD40 all over the bushing/spring areas where pedals pivot. Did not help at all even after extensive pumping and sitting overnight with the WD40.,

Thanks! Tom