Is the brake light switch on my 1996 chevy pickup adjustable?

Is the brake light switch on my 1996 chevy pickup adjustable? I have no brake lights, but I have tail lights and turn signals. My wife was following me when I stepped on my brakes for a turning car the brake lights worked then stayed on for a while. my wife thought I was riding my brake pedal ( I was not), then the lights went off and never worked again.