[s-cars] Brake warning light?

[Ian Duff]

So, riddle me this: what turns on the brake warning light, the red one that
says "Brake"? I just replaced all 4 lines with ECS stainless lines w/ Earls
ends, flushed/pressure bled with Super Blue. Well, not me, but me "helping"
Paul Royal, thanks, Paul. Awesome brake feel, reservoir is full. "Brake"
light flickers on and off, sometimes stays on for half a minute or a minute,
sometimes stays off for quite a while. It goes off very quickly after
starting the car, then may come on at seemingly random instances, for random
durations. WTF did I do wrong (MUST be my fault, nothing Paul did could be
anything but the best)?
-Ian Duff.