2006 Honda Odyssey brakes problems

Tl* the contact owns a 2006 honda odyssey. The contact stated that while entering a drive way, the brakes failed and no warning lights illuminated on the instrument panel. The contact crashed into the front right side of the house and the air bags failed to deploy. No police report was filed. The vehicle was destroyed. The driver sustained injuries to the hand, arm, neck, and shoulder. The manufacturer was made aware of the failure. The vehicle was not diagnosed or repaired.

My wife purchased a new vehicle and took possession of our 2006 honda odyssey van. I immediately noted a very soft brake pedal. When pressure is applied, the pedal goes all the way to the floorboard while stopped at a stop sign or traffic light. The vehicle has not rolled forward while the brake was set but I feel it may if it sat long enough with the brake pedal depressed. No repair has been attempted as I'm not certain of the cause. Brake fluid is not low so I assume air has somehow gotten into the brake lines.