91 chevy lumina brake lights

I have replaced the bulbs,checked all fuses,checked wiring and still no luck. I want to replace the switch,but their are two not sure witch one it is and how much it is. Any suggestions any one. Thanks

it is probably not the brake switch. try this. with foot on brake turn on turn signal, then turn off with foot still on brake. now will brake light be on? i am having same problem and think it is a malfunction in the turn signak switch mechanism.. hoping i can replace the part and not the entire steering col.
let me know what you find out