This circuit function is to make the LED illuminate while the red rear lamp in switched on and when the brake pedal is pressed, it will activate the RELAY1 and the LED will start blinking. The LED will immediately stop blinking when the brake pedal is released.
Using 555 timer IC as a LED blinker, R1 & R2 can be changed the value to adjust the LED blinking speed to suits your preference. You could also replace the R1 and R2 with preset or variable resistor (value: 100K ohm) for easier speed adjustment.
It is a simple, cheap and easy to make circuit. The cost estimation is around RM10 and can complete within 1 hour.
I hope you'll enjoy this simple DIY

Вкратце- эта схемка для доп. сигнала "стоп". При нажатии педали доп.сигнал начинает мигать.