BMW Brake Force Display coded on F80 M3

[jcote258]

I curious to know what he thought of the flashing lights, too late now but would have been cool to get the insight of the person behind you.

[BooGooBird]

Originally Posted by USAM3

I am so glad I coded this. I believe it prevented me from getting rear ended. I was in a caravan of cars going about 85mph when we came upon a bend in the freeway and around the bend was a traffic jam. The car in front of me slammed on his brakes but couldn't stop in time and hit the car in front of him. I slammed on mine as well and the car that was behind me most likely saw my brake lights flashing which gave him enough time to get on his brakes. I thought for sure he would rear end me but got right up to my bumper and stopped in time. I strongly believe if my brakes did not strobe he wouldn't have gotten on his brakes hard enough to avoid hitting me.

if you have led bulb replaced with stock one, then it has better chance to prevent you from rear ended
this is mine with led bulb looks like

I am still working on brake strobe, thinking if it blinks more quicker than that would be better

[terahertz]

Originally Posted by BooGooBird

if you have led bulb replaced with stock one, then it has better chance to prevent you from rear ended
this is mine with led bulb looks like

I am still working on brake strobe, thinking if it blinks more quicker than that would be better

I'm still waiting for my car to arrive and I've never coded an F80 yet, but on my E90, there was a codeable option to change the blinking frequency from 3hz to 5hz. 5hz was too fast for the non-led brake lights, but I was also able to make the BFD work only on the 3rd brake light which was LED.

[BooGooBird]

Originally Posted by terahertz

I'm still waiting for my car to arrive and I've never coded an F80 yet, but on my E90, there was a codeable option to change the blinking frequency from 3hz to 5hz. 5hz was too fast for the non-led brake lights, but I was also able to make the BFD work only on the 3rd brake light which was LED.

Yea, I saw the post where you can change the freq on E90, I couldnt find anything similar on F30/80 tho

[BooGooBird]

Originally Posted by BooGooBird

Yea, I saw the post where you can change the freq on E90, I couldnt find anything similar on F30/80 tho

Found it
REM
3064
ESS BLINKFREQ 1
change value to 05
ESS BLINKFREQ 2
change value to 05

[zhan28]

Has anyone replaced these bulbs with LED bulbs for the emergency flashing brake lights? I know the bulb is H21w, at least for the f80 m3.

If you've done it, which bulbs did you get? I think the socket is bay9s but can't confirm through searching. Please post pics, video, and size of LED bulb replacement please. Thanks!

[nene]

On the M4 convertible the inner and outer brake lights are both H21w. I replaced them with LED version I got from Amazon:
iJDMTOY (2) 360 Degrees Brilliant Red 13-SMD H21W LED

Daylight and nighttime brightness is the same as halogen: