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      07-17-2018, 11:49 AM   #5
boyce89976
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Drives: 2014 X5 5.0 M Sport
Join Date: Jun 2013
Location: TN

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Quote:
Originally Posted by Cabrio330 View Post
Any advice is greatly appreciated! I have a 2015 X5 xDrive35i with M Sport Package (337) and Adaptiv M Suspension (2VF), with 56,xxx miles. I purchased this car one year ago with 42,xxx miles.

Often times when driving over the lousy bumpy roads here in Dallas, TX, the car seems to shimmy from side to side horizontally, especially (only?) at the rear. The sensation stands out because I expect up/down movement throughout the entire car, not the side to side movement. It is almost as if the rear of the car is being pushed side to side while the front stays planted.

Does this sound like a suspension issue, or maybe a wheel alignment problem? I am woefully ignorant on these matters.

I will be taking this car in for a check before a long upcoming road trip, I would like to be able to point the mechanic to the potential causes of this issue, rather than merely trusting them 100%.

Hope this makes sense, thanks for any tips or help!
I had a 335 that did the same thing. While cornering over bumps, as the rear suspension rebounds, it feels like the rear end, but not the rear tires, shifts slightly toward the outside of the corner? Almost like the the car is moving laterally on the suspension.

Do you have run flats installed, or regular tires? I never had it checked, but my theory is that since the suspension compliance is designed for run flats, with regular tires, the sidewalls flexing laterally under rebound is what we're feeling.

That's a pure guess, though.