Guy's-n-gals...
The only brake light that is directly associated with the emergency brake is the OPTIONAL one (I think it was in the lighting option group, actually) that is a large one that is on the lower dash just near the emergency brake handle.
On cars so equipped, it has a little switch that detects if the handle is not pushed in all the way, and if it sees that it's not (i.e., it decides that the emergency brake is on) - it flashes the warning light - trying to get your attention before you burn off your brake shoes *L*
I'm pretty sure if the brake light on the dash is only connected to the proportioning valve switch (see the other brake light thread in this group for a detailed, blah-blah-blah, boring discussion submitted by one of our members who thinks he knows it all, but is really a huge, break-it-or-accidentally-fix-it garage warrior.
'course - this is info learned from books and from personal experience with my '67 standard - I could be completely off base for the RX7...in which case, I NEVER SAID THAT!!!