One problem related to brake drum wheel cylinder has been reported for the 1998 Kia Motor Sephia. The most recently reported issues are listed below.
When applying brakes they squeal/ pulsate, and there is extended stopping distance. Dealer has replaced defective front rotors 4 times with new and improved rotors. Rear rotors were replaced 2 times. Rear wheel cylinder replaced once. Brakes have been squealing and pulsating again at this time.