Picture of Brake LED for bicycle
It is great to have a brake LED instead of using a reflecting one for your bicycle.The reflecting one works only at night and it cannot glow when you are using your brake, so its good to fix led in it.This instructable shows how  to fix led in the rear reflector.It is easy and it takes only ten steps to complete.The only thing is you have spend some time to save your life.
   LED bulbs(min-2)
   2 Batteries(4v)
   Thin strip of conductor
   Connecting wires
   Solder iron
   Wire striper
   Glue gun
   Insulation tape
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Step 1: Drilling holes for led

Picture of Drilling holes for led
Mark according to the size of led and number of bulbs and start to drill on the back of the relector. Make sure that the edge of the led suits correctly into the hole.I have used 6 led to get bright light.

Step 2: Remove reflecting paper

Picture of Remove reflecting paper
A silver colour reflecting paper and a thin sheet of paper is placed inside the reflector.You have to remove it because it will not allow the light from led to glow on the front side of the reflector.The paper can be removed by pouring water inside the drilled holes.I used the hair pins to remove the reflecting paper.

Step 3: Connecting wires to the led

Picture of Connecting wires to the led
Cut the long electrode from the led to avoid shorting between the leds.Solder the insulated wires to the leds using solder.Use parallel connection between the bulbs for effective glow.Check it with the battery you are going to use.I have soldered three bulbs for the front brake and three bulbs for the rear brake.

Step 4: Installing the LED

Picture of Installing the LED
Use the glue gun and drop the glue on the edge of the drilled holes.Place the soldered leds carefully into the drilled holes before the glue dries.Be careful that you are not damaging the wires because it is a hard work to solder the wire after completing the project.
uzzytech1 year ago
wow great project exactly what I was looking for but shorting the circut will drain the battery life much quicker do you know how long it lasts?
wobbler uzzytech9 months ago

@uzzytech: See Zneg's reply as to why you should really look for another solution than this one unfortunately.

subashduraisamy (author)  uzzytech1 year ago
hey thank u there just cut off the circuit when you dont want to use the led which will increase the battery life and avoids damage of battery
wobbler9 months ago

This is not a good circuit or the way to wire up a brake light. Although this will work, it's not a good design. All you are doing is shorting out the battery to turn off the brake light. The battery won't last long as you are feeding it through a short circuit. What you should be doing is making the switch such that it makes contact when the brakes are applied. This is then placed in series with the brake led so that the led only comes on when the brakes are pressed.

This is both safer (no risk of the battery exploding or catching fire) and also kinder on the battery, which will now last a lot longer.

Znegl1 year ago
Shorting the batteries as described in this Instructable is the worst thing you could ever do to batteries. Batteries are not meant to be shorted and may catch fire when shorted. Also the wires may get very hot and burn you when you touch them.
Instead make a propper switch where the whole circuit is open when no breaks are applied and the circuit (with the LEDs in it) is closed when brakes are applied.
uzzytech1 year ago
hey great project !

how can i make it so if i press the brake lever to brake the leds should go on when i leave it they go off? please helpp thank you
subashduraisamy (author)  uzzytech1 year ago
please read the step7&8 carefully for your answer