The contact owns a 2017 Chevrolet Silverado 1500. The contact stated while driving 50 MPH, the brake pedal was depressed and failed to respond. There was an abnormal sound coming from the brake pedal. There was no warning light illuminated. The vehicle was driven to an independent mechanic; however, the vehicle was not diagnosed. The vehicle was previously repaired under NHTSA Campaign Number: 19V645000 (Service Brakes, Hydraulic). The contact stated that the failure persisted. The local dealer was contacted and an appointment was pending. The manufacturer was not made aware of the failure. The failure mileage was approximately 48,853.