Car jerks forward during stopping?

e90_m3 · 04-03-2008, 02:49 AM

Ok, I notice this happened to me ~6 times now. When the car slows down and I step on the brake, right before it stops completely, the car jerks forward momentarily as if the gas pedal is pressed.

Anyone experience this and what it is? (I have a steptronic if it matters)

Robert · 04-03-2008, 03:23 AM

So you have brake and gas at the same time???

I am sure if are at a stop with one foot on brake and slowly increase gas, eventually the car will break lose of the brake's hold and lurch forward.

Redline · 04-03-2008, 03:27 AM

torque converter problem?:iono:

mateo · 04-03-2008, 04:08 AM

Damn

MVF4Rrider · 04-03-2008, 05:27 AM

Are you manually shifting to 1st gear? (using the steptronic) It's possible that's automatically blipping the throttle and causing a slight forward surge???

Swift135 · 04-03-2008, 06:29 AM

If it is just moves an inch or two than it may be the soft stop brake system. It lets the brake pressure off just before dead stop to reduce the jerk back of the car as it comes to a complete stop.

asv · 04-03-2008, 11:26 AM

Quote:

Originally Posted by robert

So you have brake and gas at the same time???

I am sure if are at a stop with one foot on brake and slowly increase gas, eventually the car will break lose of the brake's hold and lurch forward.

That would be my first guess too.

e90_m3 · 04-03-2008, 12:43 PM

Quote:

Originally Posted by Swift135

If it is just moves an inch or two than it may be the soft stop brake system. It lets the brake pressure off just before dead stop to reduce the jerk back of the car as it comes to a complete stop.

This could be it. But is it that noticeable?

PS: I feel the car is like a wild horse...even if i step on the gas a little bit at a light stop, the car jumps (my wife was asking me why I floored it the other night and I said I didn't!)

Dave · 04-03-2008, 12:49 PM

Quote:

Originally Posted by e90_m3

This could be it. But is it that noticeable?

PS: I feel the car is like a wild horse...even if i step on the gas a little bit at a light stop, the car jumps (my wife was asking me why I floored it the other night and I said I didn't!)

ditto on the wife comment.... it is a frisky car

MZWIE · 04-03-2008, 01:01 PM

I experience the same thing. I am convinced it's the hill holder feature. Mine does it in reverse every time.

Feel like the car is stuck and then suddenly releases.

I thought the car was broken...whew!

mistermojorizin · 04-03-2008, 01:08 PM

anyone experiencing this with a manual? or just the ones "with paddles"?

mrgoochio · 04-03-2008, 01:22 PM

Are you releasing the break prematurely as you would in a car without the soft stop feature? The car is designed to 'soft stop', so there is no need to compensate like a regular car would. I guess this could cause a minor 'jump' forward

dclee1 · 04-03-2008, 01:27 PM

Quote:

Originally Posted by mistermojorizin

anyone experiencing this with a manual? or just the ones "with paddles"?

Also, if anyone is noticing this with a manual, did they have their CDV removed?

MZWIE · 04-03-2008, 01:28 PM

I also remember reading somewhere that this transmission is not like other autos where one can lift off the brake and then start rolling.

As I recall this goes into a full neutral like condition until power is applied again. Wonder if that may be what we are experiencing.

Perhaps some E90 3-series owners could shed some light one this.

plien69 · 04-03-2008, 01:42 PM

Quote:

Originally Posted by e34m5

I also remember reading somewhere that this transmission is not like other autos where one can lift off the brake and then start rolling.

As I recall this goes into a full neutral like condition until power is applied again. Wonder if that may be what we are experiencing.

This is not the case, from what I've experienced. In fact, quite the opposite.

I find that the engine+transmission is quite aggressive in it's roll forward torque at idle. Aggressive to the extent that I find I have to keep slightly more pressure on the brake to keep the 135i from moving forward than I do with my wife's Honda Odyssey, for example.

EDIT: this might also be a function of brake force modulation, as well.

Robert · 04-03-2008, 01:48 PM

Quote:

Originally Posted by mistermojorizin

anyone experiencing this with a manual? or just the ones "with paddles"?

Nope, not my 6 speed manual. Then again, I keep it in neutral at a stop and only goes forward when I engage the clutch.

6MT FTW again. :thumbup:

e90_m3 · 04-03-2008, 02:06 PM

Quote:

Originally Posted by mrgoochio

Are you releasing the break prematurely as you would in a car without the soft stop feature? The car is designed to 'soft stop', so there is no need to compensate like a regular car would. I guess this could cause a minor 'jump' forward

Good point, let me try this out next time without releasing the brake to compensate.

Robert · 04-03-2008, 02:08 PM

Quote:

Originally Posted by e90_m3

Good point, let me try this out next time without releasing the brake to compensate.

Another thing could be drive by wire. My civic gets confused once in a blue moon and would suddenly lurch forward.

Stew · 04-03-2008, 02:55 PM

Quote:

Originally Posted by e34m5

I also remember reading somewhere that this transmission is not like other autos where one can lift off the brake and then start rolling.

As I recall this goes into a full neutral like condition until power is applied again. Wonder if that may be what we are experiencing.

Perhaps some E90 3-series owners could shed some light one this.

I was wondering about this too, for the hill assist feature...does it apply in all cases, even reverse (auto and MT)? It would be a little annoying not to be able to roll your car down a hill if you wanted/needed to...

MZWIE · 04-03-2008, 02:57 PM

The hill holder only holds it for two seconds after which it releases and you will roll.

Mad Dragon · 04-03-2008, 05:53 PM

It's the soft stop. E90s do the same thing.

InOttawa · 04-03-2008, 06:50 PM

What's a soft stop?

04-03-2008, 02:49 AM	#1
e90_m3 Private 5 Rep 74 Posts Drives: Join Date: Dec 2007 iTrader: (0)	Car jerks forward during stopping? Ok, I notice this happened to me ~6 times now. When the car slows down and I step on the brake, right before it stops completely, the car jerks forward momentarily as if the gas pedal is pressed. Anyone experience this and what it is? (I have a steptronic if it matters)
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04-03-2008, 03:23 AM	#2
Robert Major General 417 Rep 6,968 Posts Drives: 135i -> is350 -> Tesla M3 perf Join Date: Aug 2005 Location: Socal iTrader: (1)	So you have brake and gas at the same time??? I am sure if are at a stop with one foot on brake and slowly increase gas, eventually the car will break lose of the brake's hold and lurch forward. __________________ - There's nothing in my pocket other than knives and lint
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04-03-2008, 03:27 AM	#3
Redline Private First Class 22 Rep 143 Posts Drives: Join Date: Oct 2007 iTrader: (0)	torque converter problem?:iono: __________________ AlpineWhite (deciding) Black Leatherette (for sure) Glaciersilver or Highglossblack trim Sport Package Active Steering Manual Transmission :roundel:
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04-03-2008, 04:08 AM	#4
mateo Addicted Member 15 Rep 603 Posts Drives: Join Date: Jul 2007 iTrader: (0)	Damn __________________ [SIGPIC][/SIGPIC]
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04-03-2008, 05:27 AM	#5
MVF4Rrider PCA, BMWCCA 102 Rep 2,058 Posts Drives: 997S, MV Agusta F4, E46 M3 Join Date: Apr 2008 Location: Las Vegas NV iTrader: (0)	Are you manually shifting to 1st gear? (using the steptronic) It's possible that's automatically blipping the throttle and causing a slight forward surge??? __________________ '08 Carrera S 6MT Guards Red/Black ext leather, Carbon fiber pkg, sport exh, sport chrono +, PASM, Nav, Bose, 19" forged turbos, red tranny tunnel '07 MV Agusta F4 1000 R 1+1, Corse Red/Silver, RG3 race pipes and factory race ECU
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04-03-2008, 06:29 AM	#6
Swift135 Lieutenant 23 Rep 453 Posts Drives: 330d, M3 DCT E92 Join Date: Jan 2008 Location: Brisbane iTrader: (0)	If it is just moves an inch or two than it may be the soft stop brake system. It lets the brake pressure off just before dead stop to reduce the jerk back of the car as it comes to a complete stop. __________________
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04-03-2008, 01:01 PM	#10
MZWIE Lieutenant Colonel 388 Rep 1,660 Posts Drives: M2 Join Date: Jun 2007 Location: GEORGIA iTrader: (0)	I experience the same thing. I am convinced it's the hill holder feature. Mine does it in reverse every time. Feel like the car is stuck and then suddenly releases. I thought the car was broken...whew!
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04-03-2008, 01:08 PM	#11
mistermojorizin Lieutenant Colonel 40 Rep 1,657 Posts Drives: 135i Join Date: Apr 2008 Location: Los Angeles iTrader: (0)	anyone experiencing this with a manual? or just the ones "with paddles"?
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04-03-2008, 01:22 PM	#12
mrgoochio 135i Coupe Owner! 46 Rep 1,009 Posts Drives: 2008 BMW 135i Coupe Join Date: Oct 2007 Location: Los Angeles iTrader: (0)	Are you releasing the break prematurely as you would in a car without the soft stop feature? The car is designed to 'soft stop', so there is no need to compensate like a regular car would. I guess this could cause a minor 'jump' forward __________________ 2008 BMW 135i Coupe Jet Black Sport Pkg. P1 Lemon Boston Leather High Gloss Black Trim Comfort Access System
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04-03-2008, 01:28 PM	#14
MZWIE Lieutenant Colonel 388 Rep 1,660 Posts Drives: M2 Join Date: Jun 2007 Location: GEORGIA iTrader: (0)	I also remember reading somewhere that this transmission is not like other autos where one can lift off the brake and then start rolling. As I recall this goes into a full neutral like condition until power is applied again. Wonder if that may be what we are experiencing. Perhaps some E90 3-series owners could shed some light one this.
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04-03-2008, 02:57 PM	#20
MZWIE Lieutenant Colonel 388 Rep 1,660 Posts Drives: M2 Join Date: Jun 2007 Location: GEORGIA iTrader: (0)	The hill holder only holds it for two seconds after which it releases and you will roll.
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04-03-2008, 05:53 PM	#21
Mad Dragon . 27 Rep 932 Posts Drives: 2010 GTI Join Date: Mar 2008 Location: MD iTrader: (0)	It's the soft stop. E90s do the same thing.
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04-03-2008, 06:50 PM	#22
InOttawa Private First Class 6 Rep 118 Posts Drives: Join Date: Jan 2008 iTrader: (0)	What's a soft stop?
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