Two problems related to vehicle shudder have been reported for the 1999 Kia Motor Sephia. The most recently reported issues are listed below.
Brakes are wearing out excessively & deteriorating. Whenever brakes are applied, they cause vehicle to shake. Took vehicle to dealer & mechanic changed pads & warped rotors. Also rotated & cleaned the brakes. Rear seat belt lock is too high. Air conditioner draining on floor, dealer cleaned a/c drain. Consumer feels a hard shock when shifting into gear. Engine hard to start, dealer replaced the flywheel. Binding lever failed on the parking brake.
Right after I purchased vehicle, music system had to be replaced. Battery had to be replaced in less than a year. Had to take it in for two recalls. Brakes sometimes squeak when you come to a stop. While traveling on the highway car will start to vibrate. The low fuel light comes on even though you may have over a half of tank of gas. Engine is racing to high. Notice in July/00 while driving car starts to jerk or plung forward for no apparent reason. Also when you apply your brakes it will do this. Recently I have taken car to the dealership about this problem, but they could not find anything wrong with it.