The job of the prop valve is to apply the rear brakes and bring up pressure before applying the fronts. If that leak is bad enough, the brakes may not work at all, but the safety catch inside the prop valve should have closed allowing some sort of front brakes.
Sounds like you need to replace the entire prop valve.
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Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.
-RONALD REAGAN
462 cid/ 6x-4/ TH400/ 3.36:1/ 28x10.5/ 3880#/ 12.35 @ 109.36/ 1.69 60 ft/ 4 wheel disc brakes/ 15 mpg
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