It should be right behind the brake pedal arm, it's got a threaded base that is screwed into the pedal arm and a nut that is tightened to hold it's adjustment. the switch is closed with the pedal all the way forward, when you push in the pedal the switch's plunger opens and your brake lights come on. My g/f's just went out last week(hmm)
and I picked one up from HAP for 10 bucks and it works fine. She has a 93 accord though. Honda's retail price was around 53 dollars. It might just be out of adjustment
You can see the plunger come out when you push the pedal in if you look under the pedals. If it's out of adjustment it will give you the same symtoms.