The contact owns a 2015 Kia Optima. The contact was made aware of NHTSA Campaign Number: Â 21V331000 (Service Brakes, Hydraulic) on Facebook. The contact called the local dealer and made an appointment for March 25, 2023. The contact stated on March 23, 2023, while driving 50 mph, depressing the accelerator pedal but the vehicle began to decelerate. The contact stated the battery warning light was illuminated. The contact was able to park on the side of the road and when exiting the vehicle she saw smoke but no fire/flames exiting the hood. The vehicle was not drivable. The contact towed the vehicle to her residence. The contact called the local dealer and made them aware of the failure. The vehicle was not diagnosed or repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 180,000.