[Unofornaio]

Ok here come the questions. In trying to bleed the brakes I am unable to get fluid to the driver side rear bleeder valve. Please excuse my terminology if I refer to something wrongly.This truck has a single chamber resivor. I get fluid to the other side rear valve and if I crack the line into the hub (driver side) coming from the t on the rear end I get fluid and if I crack the line going from where the main line goes in ( directly above it about an inch) I get fluid. It's flowing through the line that goes from the bottom of the hub to the top but nothing is coming out if the bleeder valve. I took both lines off and nothing is clogged. It's as though it's clogged from where the line that is isolated on the hub goes into the top just below the bleeder screw/valve. God I hope this makes sense. I sprayed a little brake cleaner in there and let it sit but still nothing. Bleeder screw was off and cleaned it is clear but even with it off nothing is coming out. I have bleed brakes before many times and the fluid usually comes out very freely the other one that is getting fluid to come out is just sort of trickling steady even after the pedsl has been in the down position for a bit. This doesn't seen right but I don't know if this single chamber has anything to do with that behay or it's something else. I was reading these years are common for the (distribution valve cylinder?) To push to one side and reduce flow. I don't want to start taking stuff apart to add more variables. If pix will help let me know. Thank you.
Edit. Ok so no valve to get stuck it's just a simple T and it's clearly not plugged or I'd not be getting anything to the back right?