1993 GMC C2500

Brakes problem
1993 GMC C2500 V8 Two Wheel Drive Automatic 230000 miles

I have replaced the following items; fuses, brake pedal switch, bulbs, so what else is there that controls the brake lights and makes them come on
beside these three items listed?
Is there some type of relay that controls the brake lights and could prevent them from coming on?

I really need to repair this problem so no one crashes into the back of my truck, it started up right before the transmission started acting up,

I would be truily grateful if you could help me with this problem so that we can drive the truck safely back and forth to work once I get the transmission error fixed,

Thanks alot sincerely Jim
January 16, 2008.

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