Quote:
Originally Posted by FMile Pontiacs
Do you have a part number and brand name for the booster with the adjustable rod?
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I just copied and pasted the replies I found verbatim, I have no idea of what brand or part numbers the guy used. I just know from a quick search that it is a fairly common problem, and seems to center around the brake booster that doesn't let the MC return all the way and residual pressure can't release causing the brakes to lock the more it is driven. The hotter the ambient air temperature was said to play a role too in some of the replies I ran across.
My personal take might be to try a shim/shims on the firewall to get some extra travel for the brake pedal. Or perhaps between the booster and MC. It would accomplish the same thing as an adjustable push rod.
Evidently the system is quite close to not having enough clearance as it was designed. As the truck gets miles on it the balance changes the wrong way causing this residual pressure due to too little/reduced travel of the components.
I personally have never worked on this problem, just getting some feedback from owners that have run into the problem, tried all the obvious fixes as you have and found out the problem is in the area of the booster.
Rock Auto has a bunch of them with notations, here's the link:
https://www.rockauto.com/en/catalog/...e+booster,1884