95 Cavalier Master Cyl/ABS problems

I got a problem with this Master cyl/ABS assembly. The ABS has 2 bleeder screws on the end of it. The front one (straight) bleeds fine. The rear/side (angled) one has nothing coming out of it and zero pressure to my RF wheel. Changed the Master cyl/ABS assembly and the exact same thing is happenning. I'm thinking the assembly is fine, seeing as 2 did the exact same thing, so is it in my wiring, computer, module, etc? Anyone ever have a problem where a certain wheel is getting zero pressure? I was told it's a common and difficult problem... people have junked cars over it.

Sometimes the bleed screws get full of rust, etc.

Take the screw right out and blow it out with air.

Not sure if this helps