brake light not working nor high brake light
no brake lights or High Brake light Fuses ok on 2008 Kia Rio5
Sounds like a probable faulty brake light switch. Check at the brake pedal for the switch and the wiring connector that plugs into it.
As Dave said likely to be a bad brake light switch, check your fuses, you will find relevant information in your owner's manual. Check here http://repairpal.com/automobile-owners-manuals-online or try this link you may be able to down load a free copy of the owner's manual for your vehicle http://www.autousermanual.com/