I have a 48 3/4 ton and I changed the master cylinder to a duel system using a master cylinder for a 1968 chevy truck. I put the front brakes on the front port and the rear brakes on the rear port of the master cylinder. I bought all new huck wheel cylinders. I cant bleed the system and achieve a high pedal. I have the wheel cylinders adjusted up so the drums are hard to turn. I want the pedal to be as hard as a rock. right now the pedal is low. maybe 4 inches from the floor and soft...... any suggestion. need help lol