Brake fluid
Are you using the original combination valve? I just finished a complete brake job on a 72 C20 to include new wheel cylinders and all the hoses. I bled the system until I got only clean fluid. The back brakes were still locking up. I disassembled the combination valve...It was full of mud and probably now working correctly. Just a thought.
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“Nothing in the world can take the place of persistence. Talent will not; nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan Press On! has solved and always will solve the problems of the human race.”
― Calvin Coolidge
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