ok i looked in the search and could not find what i was looking for.i just redid the brake's on it new Mc new air pack not rebuilds. new Brake wheel cylinder's new pads.so i shut it off drain air tanks and get back in and the brake pedal is hard as a rock when you try to push on it.when you drive it they are not hard and stop it like they should.any clues as to what i need to look at .
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