Join Date: Jul 2003
Location: Arcade, New York
That's exactly how to do it. All you do is connect a large value capacitor in parallel with your brake light circuit (the plus terminal of an electrolytic capacitor to the wire for the brake lights, the negative yerminal to ground), and what happens is the capacitor charges up as the brake lights are on, and slowly discharges thru the brake lights when the pedal is released. You may notice a slight delay when you first press the brake pedal and the capacitor charges. You can actually "dial in" the delay time using a potentiometer across the capacitor to create what's known as an RC time constant (resistance times capacitance equals 1 time constant in seconds, and it takes 5 time constants to completely discharge a capacitor, most of the charge is lost in the first time constant; approximately 90% opf the charge). Another good idea may be to put a diode in series with the brake line before the capacitor to prevent the stored charge from going back towards the brake light switch and the turn signal circuits, just like the diodes on the third brake light. It could possibly come into play when you are stopped with your turn signals on but I'm not sure...