Rear brake bleed help. Air in ABS/DSC

[dadysev]

So i've searched and searched but all threads and posts end with no solution.
Seems the rear brake lines rusted out under the drivers seat, so they were leaking for a bit. i'm guessing air got in the system which sucks.
I tried to bleed old school with the pedal, and gravity bleed yesterday for a couple hours. I only got about a half a quart/litre of fluid through both rear callipers, so i hooked up my Reihngold setup and got to the bleed section where it triggers the ABS/DSC module.
Problem is, it says to release the vent screw then click next...
Is there a vent screw on the DSC module? ( I don't see one.) Or is the vent screw the bleeder screws on the callipers?
Maybe i need to do the bleed procedure longer?
Every time i do the bleed procedure with my laptop i do see the fluid coming out the bleed screws at the calipers , but still no pressure to move the callipers.
This thing is driving me nuts!!!!
HELP!!!!