Looking at purchasing a 1992 Honda Prelude S, but has brake light on
 

Folks, what could the cause of this be? I checked the master
cylinder, and it looks as though it has enough brake fluid, and the
brakes seem to work well. Is this a common issue on this vehicle?
What else might I check?
By the way, this car has ~160,00 miles on it, and has already had two
timing belts put on it. What else goes out regularly on this car, and
is there anything that I should look out for, before biting the bullet
and purchasing it?
Thanks so much in advance!