One problem related to power assist brake has been reported for the 1996 Kia Motor Sephia. The most recently reported issues are listed below.
I have had the brakes repaired at least 10-12 times and the problem still is not fixed. The brake pedal becomes hard and doesnt depress, making stopping slow. The front wheels of the car become black,covered with the dust from the brake pads. . And at times the brakes stick and resistance is felt from the vehicle and the front tires begin to give off smoke.