Air still trapped somewhere is the most common. A good test, pump up the brakes until there is good pedal, take the cap off the master cylinder, look in when the pedal is released. a small, short fountain of fluid is normal, but if fluid keeps returning to the master cylinder, there is still air somewhere. I have reverse blead them, use a new or thoroughly cleaned pump type oil can, connect it to an open bleeder screw, and pump fluid back toward the master cylinder.
Out of adjustment shoes. Tighten the adjuster until the wheel is locked, then back off until the wheel turns, and the shoes still just drag. If new shoes were installed, they may not fit the drums exactly. They can be arc ground or will have to fit themselves with use.
Wrong components. Trucks use a variety of brake options. The master cylinder, wheel cylinders, and booster must all be the correct bore. They may look the same from the outside but be different internally. The original and new booster will have a tag, the numbers must match for it to work.
I remember years ago fighting one of those for several days. Ended up being a defective rebuilt booster.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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