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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 10-04-2012, 07:46 PM
scottys scottys is offline
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Mein Auto: 206 750LI
Hard braking, jerk at stop.

STANDARD DISCLAIMER: Yes, I did try searching. Nothing concrete. Please be nice.

PROBLEM: Just purchased a 2006 BMW 750LI. LOVE IT. Small issues here and there such as angel eye out (fixed it!!) but there is one that my mechanic and I disagree on. I am NOT a mechanic, but here is the issue:

Car drives perfect. Shifts perfect. Triptonic - perfect. Downshifts perfect. BUT, when I am coming to a stop I get a jerk. There is no unusual sound or unusual feeling in the wheel. The car simply doesn't want me to come to a smooth stop. If I am traveling at any speed and come to a stop with 'standard' brake pressure, the car will brake as usual. No shaking, no pulling. When you hit that last 5mph to 0mph stop, the stop will be accompanied by a jerk (at stop), then immediately let go - the car will move a little bit for a moment - and come to a complete stop. The jerk does not occur while the car is in motion, the jerk IS a premature stop. It is as if you are apply the brakes as usual, and right before you stop, you intentionally hit the brakes harder to have a sudden stop (the "jerk"). When the car does come to a stop, the car rocks back to forth a bit - more than you expect if you came to a hard stop. It almost seems like something is loose and is giving during braking.

If I purposely try to come to a smooth and gradual stop, I can minimize the jerk at the end, but can't get the really smooth stop that anyone would expect.

If I brake with harder pressure near the end, the car will still hit the premature stop but I can prevent the vehicle from the small movement forward.

I do not think this is a tranny issue as I even did this whole in Neutral and it still happened.

My mechanic originally thought that it was a common problem he see's that involves some parts in the front suspension (thrust bar's or something??). He has since told me that the rack needs to be replaced. I have a very hard time believing that. Again, I am not a mechanic, but in my old Mercedes S500 I had the rack replaced when I noticed I something was different in the wheel like the power steering was malfunctioning and I couldn't make fine adjustments. I could feel it. I can't feel anything in the wheel in my 750.

I have searched the forums and see this mentioned for other models, but not specifically with the E66. I have read it could be the tranny or some bushings. Before I go lay over $2000+ down on a new rack thought I would ask the community for some insight.

HELP. I would be more than happy to post a video to youtube from both the interior cabin experience and from the outside.

Thank you.
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  #2  
Old 10-04-2012, 07:55 PM
biigchiips biigchiips is offline
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Mein Auto: '06 E66 & '95 E38
the factory BMW brakes are if you may 'sticky,' it exhibits good braking performance. I say deal with it or switch out for different brake pads, preferably ceramic brake pads since they are known to have better brake feel.
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  #3  
Old 10-04-2012, 07:57 PM
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Carboy7 Carboy7 is offline
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I don't believe the brakes are THAT sticky that what you are describing is happening..unless I misunderstood your description.

It could also be that auto park is on (parking brake goes on a stops) or your transmission oil needs to be changed from downshifting from 2 to 1?
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  #4  
Old 10-05-2012, 05:02 AM
jcharris jcharris is offline
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I think it's the transmission too because I have the same problem. My car sometimes will only downshift to 2nd, taking off from a stand still like an 1986 Ford Escort, lol....
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  #5  
Old 10-05-2012, 05:33 AM
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DFEL750I DFEL750I is offline
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It's your guibo(flex disk) on the driveshaft.... Common problem. Part is about 130 and you should get the labour done for under 350 to install it. The guibo is a rubber flex disk that connects your driftsshaft to your transmission , the are metal rings within the rubber flex disk that wear off over time.
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  #6  
Old 10-05-2012, 07:03 AM
new760Liowner new760Liowner is offline
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Put the car in manual mode and shift to 1st when near a stop and then apply the brake as usual to see if the jerk happens.
I've got a little hesitation in Drive when setting off that isn't present in Manual mode; may be a transmission software issue.
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  #7  
Old 10-02-2013, 02:50 PM
jayct jayct is offline
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its not the quibo or flex disc

I have the same problem. I changed the quibo it helped a little at first but the problem is still there.
I also did the software update and no luck with that too. If u figure the problem out please let me know what it is.
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  #8  
Old 10-02-2013, 02:56 PM
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DFEL750I DFEL750I is offline
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Quote:
Originally Posted by jayct View Post
I have the same problem. I changed the quibo it helped a little at first but the problem is still there.
I also did the software update and no luck with that too. If u figure the problem out please let me know what it is.
I had the same issue. You come to a stop then after the stop car jerks forward a bit. Your problem is your torque converter.. It's is beginning to go. That also causes a rough idle and higher than normal fuel consumption. When I changed my torque converter all the issues went away. Problem is that it cost about $1000 to change the torque converter.
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  #9  
Old 10-02-2013, 03:38 PM
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PAPER PAPER is offline
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Quote:
Originally Posted by DFEL750I View Post
I had the same issue. You come to a stop then after the stop car jerks forward a bit. Your problem is your torque converter.. It's is beginning to go. That also causes a rough idle and higher than normal fuel consumption. When I changed my torque converter all the issues went away. Problem is that it cost about $1000 to change the torque converter.

ouch ...
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  #10  
Old 10-02-2013, 04:05 PM
ssdriver27 ssdriver27 is offline
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might also look at tension strut, mine did something similar and one day (I had mirrors in my garage for my weight lifting equipment) and noticed that when I stopped in the garage my front wheels would jerk forward after I stopped. my tension struts were shot and changed them and no more bump stopping. that may not be your problem but its much cheaper then the other mentioned problems. if that is it you can simply change the bushings out as they are simply pressed into the torque arm AKA tension strut.
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  #11  
Old 10-02-2013, 05:31 PM
hairtrigger hairtrigger is offline
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Hard braking, jerk at stop.

I had the same problem.....took to dealer and had the guibo replaced, after that never had it happen again.


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  #12  
Old 10-02-2013, 06:21 PM
bobbrum bobbrum is offline
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Hard braking, jerk at stop.

I replaced the Guibo joint and the Thrust Arms. I had two types of clunking noises when stopping.


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  #13  
Old 10-02-2013, 07:31 PM
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DFEL750I DFEL750I is offline
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Quote:
Originally Posted by PAPER View Post
ouch ...
Yeah it was painful but I was glad I resolved the issue.. It's a real pain. For those who think this is a guibo .., the way the problem is described it is not the case. With this issue the car comes to a complete stop then it lurches forward once... That happens when the torque converter slips.

For the people have this problem ..with the car in drive try to rev the engine to about 2000 RPM with your foot on the brake... If you can't then it's definitely your torque converter. The stall on our torque converter is 2500 RPM which means you should be able to rev the engine up to 2500 RPM before the torque converter starts trying to turn in input shaft of the transmission.

Also pay attention when putting the car into D or R... You will feel the car squat a bit in the back.. That's because the torque converter is bad and the car is trying to move when it shouldn't.
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  #14  
Old 10-02-2013, 08:24 PM
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csmeance csmeance is offline
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As others have said it's the transmission being jerky from 3-2 and 2-1. The rack really shouldn't have much to do with the problem you are having.

I would recommend checking the Guibo Flex Disk, and as well swapping out the fluid in the trans with some new stuff. I can somewhat agree with the member that posted the torque converter, with the new trans and converter in my car it's been shifting great for the last 30K miles.
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