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Old 01-14-2013, 09:55 PM
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SD ///M4 SD ///M4 is offline
(prev. SD335is & SDZ4MR)
Location: San Diego, CA
Join Date: Jan 2011
Posts: 4,476
Mein Auto: 2016 M4 Coupe | 2006 Z4MR
Originally Posted by Nordic_Kat View Post
Great Pics!
But are you positive that it's a burned out bulb? Generally, if that were the case you should have had an on-board dash warning about it. My guess is that what appeared to be a burned out taillight is perhaps the "intensive brake" light. If you aren't getting a bulb out warning from your instrument cluster, I probably wouldn't stress over it. (If you have your rear foglights enabled, you could always check it by turning them on. )
This feature is actually called "adaptive braking". It's an additional brake light that comes on in both tail lights during hard braking and is a function of the pressure on the brake pedal and/or the deceleration force.

The only way this would be what's going on in the fifth picture is if someone else is driving the car and has slammed on the brakes. I see this all the time at autocrosses and track events. If the car is just sitting there and the extra brake light on the right side is on, then there's something going on with the wiring. Unless the rear fog lights are on and the left one is burned out which may not actually trigger a warning on the dash. But this looks to me like one of the left tail light bulbs is burned out.

Here's what the rear tailights look like on our 335is along with the rear fog lights:

Originally Posted by cruisingbimmer View Post
...I realized that my left taillight is out. It makes me wonder how long - at least within the past week - that I've been driving around like that. In any case, hope you all enjoy the photos!
- Tom
His: 2016 M4 Coupe | Sakhir Orange Metallic | Black Full Merino Leather | CF Trim | M DCT | Adaptive M Suspension | 19" Black Alloy Wheels | ZEC | ZLP | ZDB | MPE | ED 5/13/16
Hers: 2011 335is Couipe | Le Mans Blue Metallic | Black Dakota Leather | Dark Glacier Aluminum | 6MT | ED 5/12/11
Also His: 2006 Z4 Roadster (E85) | Interlagos Blue Metallic | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12

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