Brake Master Cylinder problems of the 2013 Infiniti JX35

2013 Jx35 roughly 95k miles intelligent braking option soft brakes that go to the floor, not master cylinder, brake pads, or loss of brake fluid in reservoir. Dealership in previous cases have concluded after the above items being replaced and not solving the issue as abs module needing to be replaced. We sitting at stoplight brake pedal continues losing pressure and we are forced to pump the brake for the pedal to maintain pressure. Air sucking sound is heard when releasing the pedal.

August 2013 - when pressing the on the brake pedal to stop the vehicle,it will continue to move and the brake pedal will go down to the floor but it would not break and the seat belt tightens and almost rear ended the front car. I took the car to the Infiniti dealer and they replaced the master cylinder and blend system. The same problem happened again in July 2014, ran through a red light due to break pedal going to the floor and would not brake and the seat belt got tighter. Took the car to Infiniti dealer replaced master cylinder and brake booster. I filled a complained to inifiniti motors, since I'm worried there might be a problem causing brake failure.