The contact owns a 2013 Hyundai Tucson. The contact received notification of NHTSA Campaign Number:Â 23V651000 (Service Brakes, Hydraulic);Â however, the part to do the recall repair was not yet available. The contact stated while his son was driving at an undisclosed speed and depressing the brake pedal to come to a complete stop, the vehicle failed to respond and crashed into the rear of another stopped vehicle. There was no warning light illuminated. The air bags did not deploy. The contact stated that the front end of the vehicle was damaged, and coolant started leaking due to the collision. The contact's son and the other driver did not sustain any injuries. The vehicle could not be driven and was towed to an auto collision shop. A police report was filed. The dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed or repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The failure mileage was approximately 151,000. VIN tool confirms parts not available.