The contact owns a 2019 Chevrolet Silverado 1500. The contact stated while driving 40 MPH on the highway, the vehicle failed to stop as intended while depressing the brake pedal due to traffic. The contact was rear-ended and pushed into the vehicle in front. The contact depressed the parking brake and merged to the side of the road. The air bags were not deployed. The contact suffered no injuries. The service parking brake warning light and brake system failure illuminated. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not informed of the failure. The failure mileage was approximately 78,000.