Unable to pressurize brake system?

I replaced a bad brake master cylinder and bad booster. Brake pads and shoes were replaced a year ago and drive less than 1200 miles annually. I attempted to bleed system from rear to front with help and purchased a pneumatic bleeder. Bubbles continue to flow through clear tubing. The tubing attached to nipple has a tight fit. I used up three small bottles of brake fluid and just purchased a 32oz. I had replaced Master cylinder and improved but the original booster was not working properly. It was obvious to me because the rod that connects to brake pedal was disengaged, basically just hanging in there. I really appreciate if you are able to help me. I will communicate with you to inform you of end result. Thank you. Randy Garcia, Barstow, California.