The contact was driving a 2023 Kia Sportage loaner vehicle. The contact stated that while driving approximately 35 MPH and pressing the brake pedal the braking system malfunctioned and the brake pedal extended to the floor causing the vehicle to crash into the rear of a second vehicle. During the crash, the vehicle sustained front-end damage but the air bag did not deploy. Also, during the crash, the second vehicle was pushed into the rear of a third vehicle. No injuries were reported and no police report was taken. The cause of the failures was not determined. The local dealer was notified of the crash. The manufacturer has not yet contacted us. The failure mileage was 450.