I am currently in the process of rebuilding a wrecked truck. I have replaced all of the - brake lines - calipers - wheel cylinders, - pads, - shoes, - brake booster, - master cylinder
However when I start the engine the pedal still goes flat to the floor. I have bypassed the anti-lock system and still goes to the floor. I have bleed the system both manually and with an vacuum system, still having this problem used 3 boosters and 3 different master cylinders.
Am I doing something wrong? How can I fix this problem?