assuming the valve was slammed to one side, how do you fix that? new valve or?

i just want to know, this is a new one to me.

 

It's a mother to get an old one re-centered. If it's tripped just get a new one.


I edited my prior post while you were typing BTW (:

 

Not guaranteed to work but try this...


On the RWAL (Rear Wheel Anti Lock) module which sits 3" closer to the firewall than the proportioning valve, there is a rubber cap pointed horizontally right towards the master cylinder. Poke a paperclip thru the rubber cap about 1-1/2" until it touches the back of the RWAL accumulator piston. With key off, have a friend press and hold pressure on the brake pedal. If the piston moves, the service manual says to replace the RWAL. Mine moved, so the RWAL is supposedly bad. The only way for brake fluid to move the piston in the accumulator is for the anti-lock solenoid to be energized with battery voltage via the green wire on the "A" terminal of the connector... (OR if the solenoid valve is blocked open??, I thought.)


Or this...


If you end up with the proportioning valve shutting off the circuit you are working on, close all bleeders on that circuit, go to the OTHER end of the truck, have helper pump up the brakes, and HOLD it, then release one of the bleeders. This will get the p-valve to release again. Go back to what you were doing previously.

 

I have this same issue! Did you get it fixed???