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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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