Dashboard Brake Light Comes On. Why?

So far, checked fluid, which is good. Took it for another test drive. It started to flicker briefly at idle, then I accelerated and it went off. Did not happen again during that drive. Difficult to diagnose with light on, because it is so brief.

Sometimes a good hard stomp on the brake pedal can recenter that switch in the distribution block. (if that's what it is)
I disconnect those lights anyway, because I can tell when the brakes don't feel right and don't need a light to tell me.