Back Brakes won't bleed

If it gets off-center; pump brakes, slowly press pedal until you feel a click, stop pressing, close the bleeder. Not clear, 2 people there. Been 45 years, done a lot of them, can't remember, seems bleed the front, for the click-oh, light will go out too.

I would try and recenter the PV as said. If you crack the line to the front right at the PV and have someone press the pedal and listen for a click, that might straighten it out. Sometimes people bleed brakes and have a tendency to push the pedal tight to the floor which can off set the valve. I use a small block of wood under the pedal so as not to do this.

Of course now that I have a Mighty Vac, I use it.