How do you adjust 2001 Kia Sephia emergency brake?

The E-brake on that car (as on most cars) is simply a mechanical brake that relies on the rear drum brakes without the hydraulic assistance of power brakes. When you pull up on the handle, a cable activates the rear brakes only. If your car rolls with the E-brake on, even if it still brakes fine on the road, odds are your rear brake shoes need to be replaced. To replace them, lift the car and remove the rear wheel rims. Tap the rotors around the edge with a mallet to knock them loose (they will be rusted on and may take a little bit of work), but be careful not to crack the drums with your mallet. Once the drums are off, you will see the brake shoes, connected with several springs to maintain proper positioning, and there will be a small slack adjuster at the bottom between each set of shoes. It is a long cylinder shape with a slot in each end and a fine-toothed sprocket around the middle of it. This is not to be adjusted by hand, it is self-adjusting every time you apply the brakes. Remember the position and sequence of each of the springs as you take them off to replace the shoes. It may help to take digital photos, or to lay out the pieces in the same orientation on the floor next the car. Once you have replaced the shoes, slip the drums back on. They may slip a little as you replace the rims, but they will tighten as you tighten the lug nuts - be sure to torque the lug nuts in proper sequence - like drawing a 5-point star on paper. Then apply the foot brakes several times to activate the auto slack adjusters, and then the hand brake should work fine. Your car will no longer roll and you will have better stopping power.