It is the Kia control arm on the front end of your vehicle that controls the movement of the wheel assembly. This movement is forward and backwards as compared to the frame of the car.
The location of the Kia control arm is on the lower portion of the front wheel assembly and the frame of the car. One of both ends will have a polymer grommet that will wear out in time. There are also a few Kia models that have ball joints at one end that will also wear out over the life time of your vehicle. When this occurs, the control arm will have to be replaced so the driver will be able to maintain control of the vehicle when it is traveling down the road.
Once the location of the control arm is found, then an inspection can occur. If the polymer grommets are split, cracked or gone, then it will have to be replaced. If your suspension component has a ball joint, then the amount of play up and down the joint has should be tested to ensure it is not worn out.
The problem a Kia owner will have when the control arms on their vehicle are worn, the movement of the front wheel assembly forwards and backwards increases beyond the design specifications of 1%. The greater the movement of the wheel assembly is will cause a decrease in control of the vehicle when it is on the road. This excessive movement will also damage other components on the front end of your Kia causing them to need replacing as well if the worn out control arms are allowed to remain in place for an extended period of time.