is my proportioning valve bad?? just another brake question

[jmarshall97]

So both my dad and i are having some breaking issues with our square bodies. His is a 1988 r2500 crew and mine a 1986 k20. On my truck when we bleed the rear brakes it just drools out the bleeder, it is quiet honestly pathetic, so i had a looky loo at my proportion valve. I took the rubber cap off and pushed on the button but it didnt budge, i think it may be stuck but how do i know for sure? I havent blead the front breaks yet, but my dads truck is having a similar problem drooling at the back and a fountain at the front and i have a feeling the prop valve is to blame. Any insight would be helpful to the both of us thanks!!

[hrc200x]

Maybe pull rear bleeders all the way out and make sure the hole isn't crushed down from over tightening and clear of any debris.

[benscool1]

I had the same issue on my 84 after replacing about half the brake lines, my proportioning valve was stuck. I STOMPED on the pedal as hard as I could and it freed up the valve. If that doesn't work bleed the front and then try again.

[Rubble]

Your proportioning valve might be slid over to one side like benscool suggested,but also you might have to bleed them at the master cylinder too.I just went thru this on my 82. Had just a dribble out the rear wheel cylinders,so bled the master first & then lots of Fluid at the rear.Try that too...
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[jmarshall97]

well i tried bleeding them again today with the truck running and got much better pressure but the pedal still feels really spongy, is there a solution for that?

[Rubble]

If your pedal is spongy,good chance you still have some air in the system.
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