Strange Electrical Issue
 

Lately, I've encountered this weird electrical problem. Whenever I hit the brake pedal, >75% of the time the CD player turns off. It only happens when I'm moving, though. The battery and alternator have tested fine. I plan to clean up some grounds and add some new ones, but I'm not so sure if this is the real culprit.

Any ideas?

Did you Forget what you are DRIVING again?
You got 40 people to look but they have no clue what car you have.

This is for a '93 FD chassis RX-7.