I installed a sub and amp yesterday to get more bass on my FD1. I pretty much followed where to wire the amp remote on the brown cable of the brake pedals but I just noticed today ever time I hit the brakes the sub cuts off. My wife was actually laughing as she noticed it and I told her I need to drive without braking. Too late to rewire now and will try to fix it next week .
I will update next weekend if the Brown cable on the FD1 actually cuts power when brake pedal is press.