2000 Lumina Break Lights

First no light s were working. Had a guy work on it and got all my lights working except the break lights. My middle light worked. He said the middle light was on a different conection, and that I needed a break light switch. So I got one, and it break lights still don't work. I've had 2 people check to make sure switch was installed properly and needed no adjustment...course..checed all bulbs and fuses. Any help or advise would be grealy appreciated.
Thanks
Scott