Bleeding brakes

I have a 1996 acura 2.5 TL. Just replaced rear brake pads and 1 caliper on rear passenger side. Trying to bleed brakes now and when I pump brakes, hold down pedal and turn bleeder screw the old fuid pumped out but no new brake fluid pumping in just getting air bubbles in the bottle with fluid in it. I read that there is a valve that restricts rhe flow of brake fluid but dont know where it is or how to open it