E90Post
 


 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Two stage brake lights



Reply
 
Thread Tools Search this Thread
      04-19-2007, 06:53 AM   #1
Z4 Beemer
Colonel
Z4 Beemer's Avatar
Scotland
83
Rep
2,353
Posts

Drives: 2009 Z4 sDrive 23i
Join Date: Oct 2005
Location: Glasgow, Scotland, UK

iTrader: (0)

Garage List
2006 E92  [0.00]
2004 Z4 2.2i  [8.00]
Two stage brake lights

This morning I had to apply the anchors quite quickly in order to stop at a traffic light changing to red. It made me wonder whether the two stage brake lighting might have come on. Does anyone know how hard you need to brake for this to happen, or is there a video somewhere that shows it?
__________________
E89 Z4 sDrive 23i... for the more discerning driver
Appreciate 0
      04-19-2007, 07:01 AM   #2
silverbmwz3
Colonel
47
Rep
2,022
Posts

Drives: X5 g05
Join Date: Mar 2007
Location: Buckinghamshire, UK

iTrader: (0)

Garage List
I never did get the two stage thing - surely the person behind you needs to know about BMWs to decode ?
__________________
Current: E90 335d (May 2007) | Black/Black | Prof Hifi | Prof Nav | 6FL | Fully Electric Seats | Xenons | Folding Mirrors | PDC
Previous: 325ci Conv. Black/Black with lots of ACS
Previous: z3 3.0 Silver with Black&Red Leather
Appreciate 0
      04-19-2007, 08:58 AM   #3
NFS
Major General
NFS's Avatar
United Kingdom
273
Rep
9,218
Posts

Drives: M340i
Join Date: Jul 2006
Location: UK

iTrader: (0)

Quote:
Originally Posted by Z4 Beemer View Post
This morning I had to apply the anchors quite quickly in order to stop at a traffic light changing to red. It made me wonder whether the two stage brake lighting might have come on. Does anyone know how hard you need to brake for this to happen, or is there a video somewhere that shows it?
This picture shows the 2 stage lights under hard braking:



Under normal braking only the outer half of the area illuminates.

I think this relies on the intuitive reaction all drivers have to a red light - i.e. stop.

The larger and brighter the red light the quicker the reaction to it.
Appreciate 0
      04-19-2007, 01:49 PM   #4
Z4 Beemer
Colonel
Z4 Beemer's Avatar
Scotland
83
Rep
2,353
Posts

Drives: 2009 Z4 sDrive 23i
Join Date: Oct 2005
Location: Glasgow, Scotland, UK

iTrader: (0)

Garage List
2006 E92  [0.00]
2004 Z4 2.2i  [8.00]
I think on the e92 its the fog lights that comes on as the secondary lights??
__________________
E89 Z4 sDrive 23i... for the more discerning driver
Appreciate 0
      04-19-2007, 02:08 PM   #5
ksfrogman
Major General
ksfrogman's Avatar
United_States
570
Rep
6,750
Posts

Drives: E90 330i 6MT
Join Date: Nov 2005
Location: Torrance, CA

iTrader: (12)

Garage List
2006 330i  [0.00]
2006 330i  [0.00]
Quote:
Originally Posted by needforspeed View Post
This picture shows the 2 stage lights under hard braking:



Under normal braking only the outer half of the area illuminates.

I think this relies on the intuitive reaction all drivers have to a red light - i.e. stop.

The larger and brighter the red light the quicker the reaction to it.
Like this.

__________________
Appreciate 0
      04-19-2007, 02:53 PM   #6
vivekk
THE Viv
vivekk's Avatar
England
184
Rep
4,743
Posts

Drives: 330i SE
Join Date: May 2005
Location: the North, UK

iTrader: (0)

Garage List
Quote:
Originally Posted by Z4 Beemer View Post
This morning I had to apply the anchors quite quickly in order to stop at a traffic light changing to red. It made me wonder whether the two stage brake lighting might have come on. Does anyone know how hard you need to brake for this to happen, or is there a video somewhere that shows it?
The 2nd stage brake light will come on when ABS intervenes.
I can't remember if it comes on under any other circumstance, but E90Fleet had some info about it somewhere.

Viv
__________________
[TiAg ▪ Dakota Black ▪ Active steering ▪ Sports suspension ▪ 162s ▪ Sports seats ▪ Al trim ▪ Bi-Xenons ▪ F&R PDC NavPro ▪ Voice control ▪ Bluetooth ▪ 6CD Logic7]


Appreciate 0
      04-20-2007, 12:44 PM   #7
dxb335d
The Tarmac Terrorist
dxb335d's Avatar
England
940
Rep
29,345
Posts

Drives: 997.2 GT3
Join Date: Mar 2007
Location: ''Fandango Towers''

iTrader: (3)

Garage List
ABS shoudl rarely ever come on even when you brake ultra hard after someone pulls out in front of you

i was led to beleive they come on under 'hard braking' not absolute emergency shit-the-bed ABS braking?!

carl
Appreciate 0
      04-20-2007, 12:51 PM   #8
Z4 Beemer
Colonel
Z4 Beemer's Avatar
Scotland
83
Rep
2,353
Posts

Drives: 2009 Z4 sDrive 23i
Join Date: Oct 2005
Location: Glasgow, Scotland, UK

iTrader: (0)

Garage List
2006 E92  [0.00]
2004 Z4 2.2i  [8.00]
Just to clarify, I did brake quite hard, but I thought if the ABS activated the light on the dash would flicker like it does with the traction control (so I am told )

The ABS dash light never flickered but I thought because I really did apply the anchors quite firmly and stopped quite quickly, the second set of lights might have come on.

Come to think of it, I wonder if the feature that when you lift off the accelerator really quickly and the brakes get prepared activated The car did stop in a very short distance which I was pleased with
__________________
E89 Z4 sDrive 23i... for the more discerning driver
Appreciate 0
      04-20-2007, 12:52 PM   #9
Z4 Beemer
Colonel
Z4 Beemer's Avatar
Scotland
83
Rep
2,353
Posts

Drives: 2009 Z4 sDrive 23i
Join Date: Oct 2005
Location: Glasgow, Scotland, UK

iTrader: (0)

Garage List
2006 E92  [0.00]
2004 Z4 2.2i  [8.00]
Quite clearly we need a volunteer to try this out with a video camera. Anyone?

__________________
E89 Z4 sDrive 23i... for the more discerning driver
Appreciate 0
      04-20-2007, 01:23 PM   #10
- Paul -
Major General
- Paul -'s Avatar
England
688
Rep
7,308
Posts

Drives: see above.
Join Date: Apr 2005
Location: Yorkshire, UK

iTrader: (5)

Garage List
2005 320D SE  [10.00]
2005 645  [9.00]
Those attending the Pod meet could test this out....
__________________
Appreciate 0
      04-20-2007, 02:06 PM   #11
NFS
Major General
NFS's Avatar
United Kingdom
273
Rep
9,218
Posts

Drives: M340i
Join Date: Jul 2006
Location: UK

iTrader: (0)

Quote:
Originally Posted by Z4 Beemer View Post
Just to clarify, I did brake quite hard, but I thought if the ABS activated the light on the dash would flicker like it does with the traction control (so I am told )

The ABS dash light never flickered but I thought because I really did apply the anchors quite firmly and stopped quite quickly, the second set of lights might have come on.

Come to think of it, I wonder if the feature that when you lift off the accelerator really quickly and the brakes get prepared activated The car did stop in a very short distance which I was pleased with
I don't think the dashboard light comes on when ABS operates.

You only know it's on because of the pulsing feeling through the pedal.

Incidentally, next time it rains concentrate when you are braking and you should feel the brake drying pulsing the pedal in time with the wipers.

So cool
Appreciate 0
      04-22-2007, 07:36 AM   #12
vivekk
THE Viv
vivekk's Avatar
England
184
Rep
4,743
Posts

Drives: 330i SE
Join Date: May 2005
Location: the North, UK

iTrader: (0)

Garage List
Quote:
Originally Posted by needforspeed View Post
I don't think the dashboard light comes on when ABS operates.

You only know it's on because of the pulsing feeling through the pedal.

Incidentally, next time it rains concentrate when you are braking and you should feel the brake drying pulsing the pedal in time with the wipers.

So cool
You're right NFS- the pedal only pulses- there isn't any light on the dash which tells you that ABS has intervened- It's only happened to me once so far.

As I've said, the 2nd stage light does then come on, but as for other situations, I'm not sure.

Viv
__________________
[TiAg ▪ Dakota Black ▪ Active steering ▪ Sports suspension ▪ 162s ▪ Sports seats ▪ Al trim ▪ Bi-Xenons ▪ F&R PDC NavPro ▪ Voice control ▪ Bluetooth ▪ 6CD Logic7]


Appreciate 0
      04-22-2007, 11:09 AM   #13
Z4 Beemer
Colonel
Z4 Beemer's Avatar
Scotland
83
Rep
2,353
Posts

Drives: 2009 Z4 sDrive 23i
Join Date: Oct 2005
Location: Glasgow, Scotland, UK

iTrader: (0)

Garage List
2006 E92  [0.00]
2004 Z4 2.2i  [8.00]
Quote:
Originally Posted by vivekk View Post
As I've said, the 2nd stage light does then come on, but as for other situations, I'm not sure.

Viv
We really need to get to the bottom of this!

Quote:
Originally Posted by needforspeed View Post
Incidentally, next time it rains concentrate when you are braking and you should feel the brake drying pulsing the pedal in time with the wipers.

So cool
I have never noticed that before - but will look out for it.
__________________
E89 Z4 sDrive 23i... for the more discerning driver
Appreciate 0
      04-22-2007, 05:04 PM   #14
E92-Mark
Environmental petrol head.
E92-Mark's Avatar
United Kingdom
6
Rep
165
Posts

Drives: 330d Coupé
Join Date: Aug 2006
Location: Bristol, England

iTrader: (0)

Garage List
The second light will come on with just heavy breaking, its not tied to ABS. A friend of mine and I were racing home a couple of weeks back and since I was winning, he commented about how the brake lights came on in two stages when I was grinding to a halt.

I'd still like to see it for myself tho.
__________________


Currently : 330d SE Coupe, TiAg, Jade Leather Sports seats, HiGloss trim, 17" 188s, 6MT, CA, SunRoof, HBA, Pro Audio, 6CD, Bluetooth & Armrest
Retired : 320d SE E90, SG, Blk Leather, Xenons, Bluetooth
Appreciate 0
      04-23-2007, 02:51 PM   #15
vivekk
THE Viv
vivekk's Avatar
England
184
Rep
4,743
Posts

Drives: 330i SE
Join Date: May 2005
Location: the North, UK

iTrader: (0)

Garage List
Quote:
Originally Posted by E92-Mark View Post
The second light will come on with just heavy breaking, its not tied to ABS. A friend of mine and I were racing home a couple of weeks back and since I was winning, he commented about how the brake lights came on in two stages when I was grinding to a halt.

I'd still like to see it for myself tho.
Hi Mark- hope you are keeping well.

I expect that 'heavy' braking will turn on the 2nd brake light, however, from the mouth of the 'master':

Quote:
Originally Posted by Hornet
Do US versions have 2-stage brake lights? Judging by the video they apparently don't.

E90Fleet: 2nd stage only activates if ABS kicks in


All the best.

Viv
__________________
[TiAg ▪ Dakota Black ▪ Active steering ▪ Sports suspension ▪ 162s ▪ Sports seats ▪ Al trim ▪ Bi-Xenons ▪ F&R PDC NavPro ▪ Voice control ▪ Bluetooth ▪ 6CD Logic7]


Appreciate 0
      04-23-2007, 03:12 PM   #16
ChrisMWard
Captain
United Kingdom
14
Rep
686
Posts

Drives: E93 320d M Sport, E81 116d SE
Join Date: Feb 2007
Location: Epsom UK

iTrader: (0)

Garage List
2006 120d SE  [0.00]
2007 335d A M Sport  [0.00]
1998 M3 Evo  [0.00]
2002 330d Sport  [0.00]
2004 330d Sport  [0.00]
Quote:
Originally Posted by vivekk View Post
2nd stage only activates if ABS kicks in[/B]


All the best.

Viv
That does seem a bit daft as you can slow down quicker when the ABS isn't activated.

Regards

Chris
__________________
Previously: 2007 335D MSport E90 Le Mans Blue, 2004 330D A Sport Silver Grey, 2002 330D A Sport Saphire Black, 2001 320D SE Touring Titanium Silver, 1998 M3 Evo Techno Violet, 1996 328i Sport Montreal Blue, 1994 325i Coupe Red, 1989 325i Sport 2 door Dolphin Grey,1986 325i SE 4 door Lachs
Appreciate 0
      04-23-2007, 03:17 PM   #17
S4to335
Brigadier General
United_States
431
Rep
4,380
Posts

Drives: 2014 Audi A4 / 91 Track Miata
Join Date: Jan 2007
Location: San Jose, CA

iTrader: (5)

Garage List
Quote:
Originally Posted by Z4 Beemer View Post
This morning I had to apply the anchors quite quickly in order to stop at a traffic light changing to red. It made me wonder whether the two stage brake lighting might have come on. Does anyone know how hard you need to brake for this to happen, or is there a video somewhere that shows it?
Well, it definitely goes on...an E36 M3 guy on track reminded me that the secondary lights would go on under hard braking...I guess I braked pretty hard going into a few corners.
__________________

Car is now gone .... :-(
Appreciate 0
      04-24-2007, 11:56 AM   #18
E92-Mark
Environmental petrol head.
E92-Mark's Avatar
United Kingdom
6
Rep
165
Posts

Drives: 330d Coupé
Join Date: Aug 2006
Location: Bristol, England

iTrader: (0)

Garage List
Quote:
Originally Posted by vivekk View Post
Hi Mark- hope you are keeping well.

I expect that 'heavy' braking will turn on the 2nd brake light, however, from the mouth of the 'master':

Quote:
Originally Posted by Hornet
Do US versions have 2-stage brake lights? Judging by the video they apparently don't.

E90Fleet: 2nd stage only activates if ABS kicks in
All the best.

Viv
Hi Viv. Hmmm, dont like to differ from E90Fleet, but I'm pretty sure the ABS didnt cut in that night, and I do know how it feels on the E92 By heavy breaking I mean that oooooh crap.... feeling when you're trying to put your foot through the floor and onto the tarmac, and stuff on the parcel shelf ends up on the dashboard.
__________________


Currently : 330d SE Coupe, TiAg, Jade Leather Sports seats, HiGloss trim, 17" 188s, 6MT, CA, SunRoof, HBA, Pro Audio, 6CD, Bluetooth & Armrest
Retired : 320d SE E90, SG, Blk Leather, Xenons, Bluetooth

Last edited by E92-Mark; 04-24-2007 at 12:15 PM..
Appreciate 0
      04-24-2007, 12:29 PM   #19
Z4 Beemer
Colonel
Z4 Beemer's Avatar
Scotland
83
Rep
2,353
Posts

Drives: 2009 Z4 sDrive 23i
Join Date: Oct 2005
Location: Glasgow, Scotland, UK

iTrader: (0)

Garage List
2006 E92  [0.00]
2004 Z4 2.2i  [8.00]
I'm afraid I had another one of those " I need to stop right now" moments this morning. The lights were just changing amber and I thought I might squeeze through, but then spotted 3 police cars sitting at the junction waiting to come out! It was hard braking, but don't think ABS kicked in, tho I would have expected the 2nd set of brake lights to come on.

We really need to get to the bottom of this
__________________
E89 Z4 sDrive 23i... for the more discerning driver
Appreciate 0
      04-24-2007, 12:40 PM   #20
NathanJT
Techie Geek
NathanJT's Avatar
England
37
Rep
681
Posts

Drives: 330d M Sport Manual
Join Date: Jan 2007
Location: Derby, UK

iTrader: (0)

I had an "OH SHIT THATS*O*B*ISGONNAPLOWSTRAIGHTINTOTHESIDEOFMYFRICKI NCAR!!!!!!" moment last week when someone decided that ALL the lanes on the island were for their exclusive use no matter who else was on it.

Trust me, my feet were almost in Flintstones mode and the DSC light did NOT light. ABS definately kicked in though

Learnt one thing... these cars stop CHUFFIN FAST!!!
__________________
330d M-Sport | Sapphire Black | Black Dakota | Nav Pro | iDrive | Bluetooth | PDC | Xenons | Hot Seats | Tracker | Blacklines
Appreciate 0
      04-24-2007, 03:16 PM   #21
NFS
Major General
NFS's Avatar
United Kingdom
273
Rep
9,218
Posts

Drives: M340i
Join Date: Jul 2006
Location: UK

iTrader: (0)

Quote:
Originally Posted by NathanJT View Post
I had an "OH SHIT THATS*O*B*ISGONNAPLOWSTRAIGHTINTOTHESIDEOFMYFRICKI NCAR!!!!!!" moment last week when someone decided that ALL the lanes on the island were for their exclusive use no matter who else was on it.

Trust me, my feet were almost in Flintstones mode and the DSC light did NOT light. ABS definately kicked in though

Learnt one thing... these cars stop CHUFFIN FAST!!!
Perhaps jonmad can tell me if my 2nd stage brake lights came on during my 'tractor avoidance' maneuvre at the last UK meet?

(although I suspect he may have been to busy concentrating on slamming on the anchors to notice)
Appreciate 0
      04-24-2007, 04:26 PM   #22
mjh93sa
Major General
mjh93sa's Avatar
145
Rep
5,080
Posts

Drives: 530d
Join Date: Dec 2005
Location: Gloucestershire

iTrader: (0)

Garage List
Before this turns into another DTC / DSC thread

is your friend....

The article here suggests that a decceleration of 5m/s2 or more triggers the system. This would seem fairly sensible as you can brake quickly without using ABS. But I would have added the ABS activation as an additional trigger if I were designing the system as there is the possiblilty that you are unable to achieve 5m/s2, such as when braking on a slick surface.

The glossary here also states that a decelleration of more than 5m/s2 is required to trigger the BFD.
__________________

Gone: Fiesta - Focus - E46 320dSE - E91 330dMSport - E82 135iMSport - R55 JCW Clubman - M135i
Now: 530d
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:20 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST