Don't listen to it could be combination switch , you could replace that an still not have the lights work . Do the center high mount brake lights work or none of the brake lights ? The thing to do is test B+ voltage an ground for those circuits , we test , not guess ! Go on youtube a watch videos on basic automotive electrical circuits trouble shooting , how to read a wiring diagram , voltage drop testing . Then go to
http://bbbind.com/free_tsb.html free wiring diagrams , see what all is involved in those circuits !
Electric Testing Techniques You Need to Know If you don't know or understand what I'm telling you, you need to take your vehicle to qualified repair shop . Do go by I was told it was this or that . There are a lot of problems that can cause lights to not work .