Progressive Brake Lights
#21
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This is a quote from the UK BMW web site in March of 04 specifically in reference to the E60.
"Brake Force Display.
How does it work?
Brake Force Display is based on a variable brake light, which warns following drivers if the car in front is slowing down dramatically. Braking deceleration on the wheels is measured via the ABS sensors, and if deceleration of more than 5m/sec2 is detected, then an additional section of the brake lights is illuminated (or depending on the model, additional LEDs are activated within the brake lights). The third centre brake light is not affected."
Now from this I gather that it is more than simply of ABS is active. It uses the sensors of ABS to measure the deceleration and it has to meet the figures above, and yes it it probaly means that in 99.9 % of these cases you would be into the ABS, but not just because you have ABS active.
Once I get past my break in period I plan on trying in an out of the way parking lot some night with one of my eager sons to monitor the effect.
"Brake Force Display.
How does it work?
Brake Force Display is based on a variable brake light, which warns following drivers if the car in front is slowing down dramatically. Braking deceleration on the wheels is measured via the ABS sensors, and if deceleration of more than 5m/sec2 is detected, then an additional section of the brake lights is illuminated (or depending on the model, additional LEDs are activated within the brake lights). The third centre brake light is not affected."
Now from this I gather that it is more than simply of ABS is active. It uses the sensors of ABS to measure the deceleration and it has to meet the figures above, and yes it it probaly means that in 99.9 % of these cases you would be into the ABS, but not just because you have ABS active.
Once I get past my break in period I plan on trying in an out of the way parking lot some night with one of my eager sons to monitor the effect.
#22
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Originally Posted by E60Speed' date='Feb 28 2005, 03:43 PM
[quote name='EBMCS03' date='Feb 27 2005, 03:14 PM'][quote name='BMW RULES' date='Feb 27 2005, 10:35 AM']In Europe our brake lights are not going harder on depent on the force to brake.
The X5 and 3 coup? and cabriolet have LED. I don't understand why its not on the E60.
The X5 and 3 coup? and cabriolet have LED. I don't understand why its not on the E60.
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[/quote]X5, Z4, X3, and 1 Series dont have
So for the current production BMW's only the 7 and 6 have
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[/quote]ALL BMW's have it in the one or the other way.
The E60 has LED's in the third brake light.
Originally Posted by cobradav' date='Feb 28 2005, 04:02 PM
Now from this I gather that it is more than simply of ABS is active.? It uses the sensors of ABS to measure the deceleration and it has to meet the figures above, and yes it it probaly means that in 99.9 % of these cases you would be into the ABS, but not just? because you have ABS active.
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#23
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Originally Posted by cobradav' date='Feb 28 2005, 07:02 AM
Once I get past my break in period I plan on trying in an out of the way parking lot some night with one of my eager sons to monitor the effect.
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#24
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Originally Posted by Guest' date='Feb 28 2005, 10:01 AM
[quote name='E60Speed' date='Feb 28 2005, 09:43 AM'][quote name='EBMCS03' date='Feb 27 2005, 03:14 PM'][quote name='BMW RULES' date='Feb 27 2005, 10:35 AM']In Europe our brake lights are not going harder on depent on the force to brake.
The X5 and 3 coup? and cabriolet have LED. I don't understand why its not on the E60.
The X5 and 3 coup? and cabriolet have LED. I don't understand why its not on the E60.
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[/quote]X5, Z4, X3, and 1 Series dont have
So for the current production BMW's only the 7 and 6 have
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[/quote]The 3 has it too. 3 has it but 5 doesn't??????
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[/quote]There are no 3 Series in customer production at the moment, and it has not been confirmed if the new 3 has LED or LED look brake lights
The old 3 series coupe only had it as indicators
And as Iceman said they all have them in the 3rd brakelight.
Anywhay whats so great about having them as the normal brake lights ?
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Originally Posted by Iceman' date='Feb 27 2005, 08:15 PM
BFD is ONLY active when ABS kicks in, and when you come to a complete stop. Just at the very end of your emergency stop.
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Originally Posted by Iceman' date='Feb 28 2005, 10:06 AM
That's correct. That's why I said "to a complete stop". At the end the BFD is activated. It's not just the fact your ABS is active, but it wont happen when ABS is not active.
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cobradav's post makes way more sense. The ABS sensors (which are always active) calculate a deceleration rate that is known to be sudden (based on the formula he posted) and immediately activate the extra BFD bulbs to warn other drivers that the car is slowing more suddenly than normal. The bulbs may stay illuminated up to the complete stop -- that's sensible.
What am I missing?
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I remember reading something somewhere about how it also assited braking. If you take your foot of the gas "suddenly" then it will move the brake pads even closer to the brake disc in anticipation of you hitting the brake, then if you slam the brake really hard it applies full brake force even if you back off on the pressure a little. This latter is due to the fact that people tend to not press hard enough on the brake in an emergency, they hit it initially but then don't get full stopping power because they don't press all the way, way way, down. Do we have this feature on the e60?
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Originally Posted by wrlominick' date='Feb 28 2005, 11:14 AM
I remember reading something somewhere about how it also assited braking.? If you take your foot of the gas "suddenly" then it will move the brake pads even closer to the brake disc in anticipation of you hitting the brake, then if you slam the brake really hard it applies full brake force even if you back off on the pressure a little.? This latter is due to the fact that people tend to not press hard enough on the brake in an emergency, they hit it initially but then don't get full stopping power because they don't press all the way, way way, down.? Do we have this feature on the e60?
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We are still waiting to hear if it will be available as a software upgrade for earlier cars
#28
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Originally Posted by wrlominick' date='Feb 28 2005, 11:14 AM
I remember reading something somewhere about how it also assited braking.? If you take your foot of the gas "suddenly" then it will move the brake pads even closer to the brake disc in anticipation of you hitting the brake, then if you slam the brake really hard it applies full brake force even if you back off on the pressure a little.? This latter is due to the fact that people tend to not press hard enough on the brake in an emergency, they hit it initially but then don't get full stopping power because they don't press all the way, way way, down.? Do we have this feature on the e60?
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The other thing you mentioned is what I referred to in my earlier post as "Brake Assist." I don't know if that's the right name for it but that feature is on the E60 right now. It detects panic stops and applies maximum brake pressure because studies have shown people don't press the pedal enough for fear of locking up or something.
#29
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Originally Posted by Rudy' date='Feb 28 2005, 11:08 AM
[quote name='Iceman' date='Feb 27 2005, 08:15 PM']BFD is ONLY active when ABS kicks in, and when you come to a complete stop. Just at the very end of your emergency stop.
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Originally Posted by Iceman' date='Feb 28 2005, 10:06 AM
That's correct. That's why I said "to a complete stop". At the end the BFD is activated. It's not just the fact your ABS is active, but it wont happen when ABS is not active.
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cobradav's post makes way more sense. The ABS sensors (which are always active) calculate a deceleration rate that is known to be sudden (based on the formula he posted) and immediately activate the extra BFD bulbs to warn other drivers that the car is slowing more suddenly than normal. The bulbs may stay illuminated up to the complete stop -- that's sensible.
What am I missing?
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[/quote]I can assure you that cobradav's post is correct. I was driving and needed to brake very hard. I decellerated from 200 kph to approx. 90. Now a friend of mine was driving behind me and saw all of a sudden that the lighted area changed. My wife who was sitting in front of me swears that she saw the emergency button light up. So I'm convinced that it works when you need to deccelerate a lot.
Best regards
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Originally Posted by Guest' date='Feb 28 2005, 11:49 AM
I can assure you that cobradav's post is correct. I was driving and needed to brake very hard. I decellerated from 200 kph to approx. 90. Now a friend of mine was driving behind me and saw all of a sudden that the lighted area changed. My wife who was sitting in front of me swears that she saw the emergency button light up. So I'm convinced that it works when you need to deccelerate a lot.
Best regards
Best regards
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I can't say that anything's tied to the Emergency button light. I'm a bit doubtful that they'd tie it to that light...