Brake lights aren’t working.

I own a 73’ duster and the other day while driving someone told me my brake lights weren’t working. I drove home to see if there was something wrong with the brake light switch and when I applied power to the wire I noticed the dome light was turning on. I’ve never messed with the brake light switch so I don’t know how it suddenly stopped working. I’m new at doing electrical work and the other day I read a few threads and noticed that some people were saying this could occur when the hazard light switch isn’t working. The weird thing is is that the hazard light switch never worked when I bought the car and yet the brake lights were working perfectly fine. Does anyone know if this is true and what I should do next?