Brake light remains on. (In dashboard light)

Do you have an ABS/ESC warning lamp one? I've seen animals chew through the wires to the brake fluid pressure switch. I haven't ever seen the switch itself be bad, but there's a first time for everything. If the brake fluid is well above the low mark (at least 1/3 of the way to the full mark) and you don't see any damage to the wiring at the master cylinder. I'd say that it's time to go see your local Kia dealer.

get all the connections checked. then take it to a dealer. http://kiaoptima.org/photo-gallery/

This maybe helpful, a few years late for some though. I had the same problem a few years back, brake lights on all the time & no cruise control. Check the switch located up on the brake pedal, it may be broken. It controls both the brake lights & cuts the cruise off when the brakes are applied.

noticed the cruise control was NOT working, and that the brake lights remained on, and a small round disk with a center "pearl" the whole thing is the color of a butterscotch lifesaver, broken in pieces, on the floor under the brake. Hmmm? Hard plastic, but easily broken is many pieces. Wonder what this is? I told my husband to pull the fuse for the brakes, so it doesn't end up draining my battery.

Jaslady, you got it right. Brake lights would not go out. Checked the floor under the brake and there was the broken yellow life saver. Thank you for posting. I just wedged the broken piece between the brake arm and the assembly so the lights would go off for the night. Taking it to the dealer (or Autozone) tomorrow to get that do-hickey replaced.

Wow, thanks guys I was almost ready for dreamland whn my neighbor came aknocking, "your lights are on for the longest time!" Hubby took out every fuse and the wont go off he finally disconnected the cable but sure enough I went out looking for "butterscotch " and found it on the floor of the car...u guys are lifesavers.

Thanks so much we found the lifesaver thing . Hubby will work on it tomorrow , its to late in the day to mess with it . Hope he can fix it tomorrow

After superglue didn't hold it in place, 2 dimes glued together did! .20 cents and fixed! It you ever notice a dime on the floor, it came off, (so be aware). So far it is holding, and working!

I got a 2003 Kia Optima se there’s was no brake fluid going to the passenger side so we went and got a new abs block. Put it in now it’s not getting any brake fluid to the drivers side ??