If you buy the number of leds you need, connect them to a 470 ohm resistor each then connect them to a power supply ie PP9 Battery via a micro switch, activated by your brake servo moving, youll get the same effect.
Thats what I did and they work fine....I even decided to run a series of leds across the front of my hummer body just like knight rider and it looks pretty funky in the dark!! rofl