The contact owns a 2013 Lincoln MKX. The contact stated while driving at various speeds, the brake pedal was depressed, and the brake pedal felt soft. The contact depressed the brake pedal to the floorboard while slowing the vehicle. The contact stated no warning light was illuminated. The contact had taken the vehicle to an independent mechanic, who referred the contact to a local dealer. The vehicle was diagnosed, and it was determined that the HECU was leaking, causing the brake booster and other braking systems to fail. The vehicle was repaired. The manufacturer was not informed of the failure. The contact was advised by an independent mechanic that the brake failure for the year, make, and model was known by the manufacturer. The failure mileage was approximately 130,000.