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Do both wheels lock or just one. If you have a bositive rearend this may be hard to tell. With that age of truck you may have loose rubber in the flexable hoses that connect the pistons to the tubing at the wheels.. this aged flexable hose or hoses my be causing your problem. Just a suggestion. I have had this hapen on older vehicles
is brake pedal hard to push down without engine running ,if so proceed to step two and thats to start engine and then push on brake and if pedal softer to push then the servo is working ,now if excessive pedal travel with engine running then remove the rear drums ,make sure the outside lip is cleaned out and then adjust the brake shoes manually till they rub when you turn the drum ,this will cure it but remember that it has to bed in of course new pads brake disks ,new shoes and drums it has to bed in so give it a chance .
Both air in the brake lines and rear drums too far out of adjustment will cause the pedal to go to the floor repeatedly.
Bleed from the wheel that's farthest away from the master cylinder first, typically driver's side rear. Then bleed the others, ending with the one that's closest to the master cylinder. Generally, right rear, left rear, right front, left front.
Adjust the rear brakes until you hear them rub a bit as you turn the wheel, then back off a couple of notches. Be sure to use the brakes when backing up at first, let them adjust themselves up to where they should be.
Have you changed the brake hoses on the front going to the brake caliper?If not,this could be the problem,also,when bleeding,only pump the pedal one time upon releasing the bleeder screw,do not pump the pedal,start at the master cylinder,then the right rear,and the left rear,and the right front and left front in that order,adjust the rear brakes to where the brakes are dragging pretty good,but are not locking up,
check the brake light switch. when you step on the brake pedal, it allows the 'normally open' switch to move to the 'contact position'. If it's not broken, it may just need adjusted, or a shot of WD40 if it sticks.