Brake proportioning valve help
 

I'm not getting much fluid out of the rear brake lines, and as far back as I could follow them, none of the lines were collapsed. So at this point I'm pretty sure the problem is with the proportioning valve. I took it out once already to try to give it a quick clean but that didn't fix anything. I'm going to take it out again once I have time with the car again.
So what I want to know is
A) Is there a proper procedure I should follow to clean out the proportioning valve or should I just blast it from the opened hex nuts with brake cleaner till it can't take anymore
and
B) Does the proportioning valve stay the same between all model years? I have a 79 but would I be able to swap between any other year first gen with drums?

Thanks!

So it can get stuck. To unstick it you have to really jump on the brakes a couple times with a lot effort. This
usually will get it shifted back in place to allow fluid to the rears. Had to it few times after a complete
fluid change.

I'm guessing you mean jump on the brakes while it's not moving? I've slammed the shit out of the brakes already to try and reset it while it was in the air.
If on the other hand you mean try going at it while it's still in motion on the road somewhere like an abandoned parking lot-well I'm always happy to drive her again!

No, I mean while it sitting on stands. You have to do it violently and rapidly. Get mad at it!

sorry, I don't mean to hi-jack ur post....bit does anyone know of a simple ADJUSTABLE brake proportioning valve? preferably one that can bolt on with the same hardware.

Thx