The contact leased a 2021 Ford Mustang from an Enterprise rental company. The contact stated while driving approximately 3-5 MPH and coming to a complete stop, the brake pedal was depressed but the vehicle failed to respond, lunged forward, and hit the rear of the vehicle before him. The contact stated that it was a fender-bender; however, the front of the vehicle sustained damage. The air bags did not deploy. There was no warning light illuminated. The contact did not sustain injuries. The occupants of the other vehicle did not sustain injuries. There was no police report filed. The contact was able to continue driving. The dealer was notified of the failure and informed the contact that there was no recall associated with the failure. The vehicle was returned to Enterprise rental company. There was no further information provided. The manufacturer was not notified of the failure. The failure mileage was approximately 4,000. The VIN was unavailable. .