Wheel bearing going out, you always change both sides when you do anything with brakes.
Replace the front break lines....they rot internally.
had the same problem on my Taurus and Saturn Vue.
both had over 100.000 miles
SOURCE: 2004 KIa optima center consol
Should be screws hidden under plugs that are the same color as the plastic. Try to remove cup holder etc there should be little pop outs. I will check on one of the kias in the lot. send me a response so I can put you at the top of the list.
SOURCE: 2001 Kia Optima front brakes locking down
A few hunderd possible causes - sticking pistons, frozen slide pins, loose pads, worn pads, offset/loose/missing bolts - caliper, worn hub bearing, defective master cylinder, malfunction in the master cylinder vacuum boost bellows. Anybody's guess
SOURCE: 2004 Kia Optima EX...Brake lights suddenly don't
You can check to make sure that the taillights have a good ground. If at all possible try using a test light or multimeter at the light. Have someone step on the brake and see if you have positive voltage to the light. If you do then it could be a faulty ground. If you don't move closer to the brake switch or even test the brake switch.
SOURCE: how do u change front brakes on a 2004 kia optima
1. Park on a flat and level surface. Apply the parking brake. Secure the vehicle by wedging something behind the wheels to prevent the vehicle from rolling.
2. Use a syringe, turkey baster or similar tool to siphon out the brake fluid from the master cylinder reservoir until it's approximately one third full. You can't reuse the old fluid, so you'll need to dispose of it.
3. Remove the wheel and the caliper guide pin bolts. Lift the caliper away from the rotor. Suspend the caliper from the frame using mechanics wire. Remove the brake pads and retainer spring from the caliper. Compress the caliper piston into the bore.
4. Reinstall the brake pads. Place an anti-squeak product on the outside of the brake pads, making sure not to get any of this on the inside of the brake pads. Reinstall the retainer spring to the caliper. Reinstall the caliper in position on the caliper support bracket. Reinstall the guide pin bolts. Reinstall the wheels.
5. Add brake fluid. Start the engine and pump the brakes 3 to 4 times.test drive at slow to moderate speeds to ensure worked correctly.
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