Sequential taillight question

When I hold down the brakes, does it keep cycling or do all bulbs light up and stay lit?

the sequential taillights only work when you have your turn signal on.

Yuck! I've been working on designing something to make my brakelights light up in sequence and keep pulsing in sequence, but I think that may be illegal, or atleast distracting. So I guess I'll just make the turn signals pulse and the brakes lights light up in sequence the first time they light. If I knew this, the project would have been done months ago. Back to the drawing board.... arrgh

there's already something for the brake lights that 'sputter' flashes as you brake and then goes solid.

Any info on it? And does it work for 4 bulbs per side? I was going to make it constantly flash and resetting them all simultaneously was the problem. But since they just light in sequence when I hit the brakes and stay on, then this is gonna be simple.