The contact owns a 2025 Volvo XC90. The contact stated that while driving downhill at 15 MPH, while depressing the brake pedal, the vehicle would not come to a complete stop as intended. No warning light illuminated. The contact stated that he drove up a hill in order to come to a stop. The vehicle was towed to a local independent mechanic, where it was left for further diagnosis. The local dealer was not contacted. The air bags were deployed. No injuries were sustained, and no medical attention was sought. A police report was not filed. The vehicle was not repaired. In addition, the contact related to the failure to an NHTSA Campaign Number: 25V282000 (Back Over Prevention) that was repaired prior to the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 5,000.