modifydtoy
+1y
that prop. valve on the back gave me a hell of a time too man- before i figured it out. the valve has one line that supplies pressure from the master cylinder, the other two- one goes to the rear brake drums and the other reverts the excess press back to the front discks. this has to happen because drum brakes dont need as much pressure to work as the front brakes do so the prop valve was put in so when the truck is unloaded half of the pressure goes to the front to keep the rear from locking up. the valve is marked with arrows to let you know which is the supply from the master cyl.any othe q's let me know! i have done a lot of research on this because i didnt want my brakes to screw up, cuz mine is a daily drvr!