1988 Accord Brake Light

Hey, I'm new to this forum, and I got my sisters car which is a 1988 Honda Accord LX. Well, today was driving and the Brake Light went on, and I'm not sure what it seems to be. Can anyone help? Thanks in advance. :confused:

Nevermind, comes out that one of the rear brake lights was out. I asked my sister if all the lights were on when I pressed the brake and she tells me yeah, so today I ask my dad and he pressed the brake and comes out that one of the lights was out.