How do you bleed air out of proportioning valve on a 1991 toyota 4 runner. I cha on 1996 Toyota 4Runner

I changed rusted out brake line, bled 4 wheels can't get fluid out of rear bleedes

Asked by for the 1996 Toyota 4Runner
2 answers
Move the valve on the rear by hand while helper pumps brakes. Load sensing proportion valve i think it is called. Also be sure bleeder screws are not stopped up.
get a shop to pwr bleed system for u