The contact owns a 2017 GMC Yukon. The contact stated while driving at 20 MPH with her daughter in the rear passenger seat, the message "Grade Braking Active" was displayed. The contact stated while making a right turn in an intersection, she depressed the brake pedal to prevent the vehicle from colliding with the vehicle before hers. However, the brake pedal went down to the floorboard and failed to respond. The contact then quickly veered to the right to prevent a crash. The vehicle hit a curb and was propelled to the left across three lanes and crashed into the rear of another vehicle. The air bags did not deploy. The contact sustained bruises on the forehead as she hit her head against the steering wheel. The contact also sustained soreness on the neck and shoulder; however, the contact did not seek medical assistance. The contact's daughter did not sustain any injuries. The occupant of the other vehicle did not sustain injuries. A police report was filed. The contact's uncle met her at the scene and drove the vehicle back to her residence. The dealer was not notified of the failure. The manufacturer was notified of the failure and informed the contact that they would send a field technician to diagnose the vehicle. The contact associated the failure with NHTSA Campaign Numbers: 19V645000 (Service Brakes, Hydraulic) and 20V603000 (Service Brakes, Hydraulic); however, the VIN was not included. The vehicle was not diagnosed or repaired. The contact's vehicle remained at her