My brake lights will not come on when pedal is pressed. All other lights work, what could be the problem?

 

At your pedal, there should be a switch that has a yellow, orange, and blue wire. Or at least close to that. The orange should always have 12 volts, powered through the hazard fuse. When depressing the pedal, you give voltage to the blue wire for the brakes, and to the yellow wire for your third brake light. This is the setup on my 89. I am assuming you have a 92, so it may have changed slightly.

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1989 IROC-Z 5.7L