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.

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.

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?

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....

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.

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.