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E85 / E86 Z4 (2003-2008)
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  #1  
Old 04-27-2013, 04:52 PM
csmax csmax is offline
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Brake Light Bulbs '07 Z4 3.0si

My owners manual says there are 2 brake light bulbs per housing (P21W and H21W).
Inside corner is where the H21W is supposed to be. Both of mine don't illuminate.
Does everybody else have 2 brake light bulbs light up in each housing?

Last edited by csmax; 04-28-2013 at 06:21 AM.
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  #2  
Old 04-27-2013, 05:12 PM
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vintage42 vintage42 is offline
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Quote:
Originally Posted by csmax View Post
My owners manual says there are 2 brake light bulbs per housing (P21W and H21W).
The area (inside corner) of the housing is where the H21W is supposed to be. In my manual there #2 Brake lamp and #5 is a brake lamp. The # 5 bulb in both housings don't illuminate. Manual says see dealer for this bulb.
My question is..why see dealer? Can't we (DIY) do it?
What model and year Z do you have?
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  #3  
Old 04-27-2013, 05:27 PM
csmax csmax is offline
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Originally Posted by vintage42 View Post
What model and year Z do you have?
Oops.. 2007 Z4 3.0si
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  #4  
Old 04-28-2013, 09:33 AM
csmax csmax is offline
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anyone anyone??
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  #5  
Old 04-28-2013, 11:57 AM
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vintage42 vintage42 is offline
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Does the manual indicate how to get the bulbs out? My 1997 manual does, and says the brake light bulbs are 12V 21W.
You could take your bulbs to an auto parts store to match up with new bulbs.
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Old 04-28-2013, 12:22 PM
csmax csmax is offline
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Originally Posted by vintage42 View Post
Does the manual indicate how to get the bulbs out? My 1997 manual does, and says the brake light bulbs are 12V 21W.
You could take your bulbs to an auto parts store to match up with new bulbs.
The manual says to take to dealer for this/these bulbs. Cant get H21W at autoparts stores.
I removed both tailight assemblies and pulled both bulbs and they look ok. In fact I don't get the bulb indicator on the dash with the bulbs in. When I remove the bulbs the indicator on the dash illuminates. So, I guess the bulbs are good..
The 2 outer brake lights work in the same assembly work and they looked to be tied all together.
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Old 04-28-2013, 12:57 PM
csmax csmax is offline
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Does everyones elses Z4 have 2 bulbs lightup on each side when applying brakes?
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  #8  
Old 04-28-2013, 01:27 PM
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I thought the 2nd bulb only lights up during extremely hard braking.
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  #9  
Old 04-28-2013, 01:34 PM
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Originally Posted by pungo View Post
i thought the 2nd bulb only lights up during extremely hard braking.
+++ 1
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  #10  
Old 04-28-2013, 01:38 PM
csmax csmax is offline
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Originally Posted by pungo View Post
I thought the 2nd bulb only lights up during extremely hard braking.
Can it be tested in the driveway with more pressure on the brake pedal or is there something else that triggers it?
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  #11  
Old 04-29-2013, 03:13 AM
Mikey48 Mikey48 is offline
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The 2nd bulb only lights up under hard braking. When the antilock brakes are engaged. That is what the manual for my 2004 Z4 says.
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Old 04-29-2013, 04:00 PM
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Clearancediver Clearancediver is offline
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Brake Light Bulbs '07 Z4 3.0si

If the INPA program works for a 2007 (mine is a 2004)... You can test the lights individually to confirm their functionality...


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  #13  
Old 04-29-2013, 04:27 PM
csmax csmax is offline
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Thanks for the help. Finally found it in my owners, but not where I thought it would be (bulbs, lights).
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  #14  
Old 08-15-2014, 11:39 AM
chickdr chickdr is offline
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I wanted to swap the stock inner brake lights for LED, but they don't seem to be user removable. Kind of silly design considering how easy the outer brake light bulbs come out.
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  #15  
Old 08-15-2014, 11:48 AM
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dc_wright dc_wright is offline
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Because they're only supposed to come on during extremely hard braking (ABS engaged) and most people don't track their cars, in fact most won't even have engaged ABS during their term of ownership of the car, the bulbs are expected to outlast the car.
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  #16  
Old 08-15-2014, 08:21 PM
chickdr chickdr is offline
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Originally Posted by dc_wright View Post
Because they're only supposed to come on during extremely hard braking (ABS engaged) and most people don't track their cars, in fact most won't even have engaged ABS during their term of ownership of the car, the bulbs are expected to outlast the car.
Understood but it makes no sense to need to go to a dealer to change them if they do burn out, or if you want to upgrade them...
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  #17  
Old 08-16-2014, 07:23 AM
kalali kalali is offline
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...if you want to upgrade them...
Why upgrade something that is never used?!
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  #18  
Old 08-16-2014, 07:57 PM
chickdr chickdr is offline
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Why upgrade something that is never used?!
Interesting assumption. How do you know I would never use them? I could get into an emergency braking situation tomorrow. LED bulbs light up quicker than the OEM's...
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  #19  
Old 08-16-2014, 08:31 PM
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dc_wright dc_wright is offline
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Your reaction time is 10x the difference in time between LED illumination and incandescent illumination.

Even short life incandescent bulbs have a life exceeding 100 hours. A very long extreme braking event is less than 5 seconds and you'd get over 70,000 of those events with a 100 hr bulb.........
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