Brake lights not working!

[lifesnotfair]

My break lights are not working. I doubt it's the bulbs, as yesterday I swapped the 89+ JDM lights and I'm having the same problem (they came with bulbs).

When I hit the break pedal, the ONLY light than turns on is the one in the spoiler.. but the tail lights do not get a "higher intensity" as they should. I mean, if it's night and I turn the lights on, the rear lights do turn on, but when one breaks, they should light up more.. And when it's daylight and I don't have them on, they should also light up when I break, but they don't. Only the spoiler one.

The dashboard doas indicate there is something wrong (you know, that light next to the "open doors" light). Well, it's not the bulbs I believe, and it's not the pedal contact (because spoiler one works), so, what could it be? Could it be the yellow box in the back? I heard that when that breaks, the break lights stay ON all the time.. is this true? I think I'll take out the box and give it to this electronic tecnician who works for us here at the company so he checks it out, coz it might be hard to find (?). Any1 has ideas?