Backstory, own a 1986 Toyota Truck. Came to me with the rear line disconnected at the T on the rear axle.
Reconnected this line and attempting to bleed down the brakes now are. The load sensing proportioning valve I believe is cock blocking me from any bleed south of the LSPV.
The good news is the bed is off this truck so everything is super accessible. I'll post a picture in the morning. If anybody has ever messed with this valve please drop me a p.m. with a phone number. I figure the procedure super straightforward once you've done it. Thanks in advance.