Greasybenz.

First things first.

Is all the gear that you have securly mounted?
Meaning, is everything bolted down and thight?

Example: My amp is bolted to my subbox but
the box is not bolted to the floor of the car.
So on occassion when braking hard the box
might slide forward a little and cause the
interconnects to be pulled ever so lightly.
But just enough to stop the music for a few seconds.

If yes then I would start looking for wires behind
the brake pedal that could be stretched or pulled
while braking hard.
Make sure that no power, ground or signal wires
are close to moving parts.
When in doubt zip tie them to other wires or solid
mounts so they don't have the chance to move.

Louis.

__________________
Not always the smartest but certainly not dumb?