are you using dot3 or dot5 brake fluid, I am pretty sure this truck uses dot5.
easiest answer is to use a pressure bleeder.
one of the 'tricks" is to get a bit of hose and put one end over the outlet of the bleeder on the drive motor, and have the other end down in a brake fluid container, so that it bubbles out the air, but any back-flow will be brake fluid.
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