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  #1  
Old 01-07-2017, 02:58 AM
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Vibration when braking at high speed

Hi all! Recently my steering wheel vibrates when slightly pushing brake at high speed over 130KM/H. However it has no vibration at all when at 110KM/H or lower. Wheels were well balanced when I changed all the tires 2 months ago. I also renewed all brake discs and all brake pads, all are BMW OE parts. Any ideas guys? Thanks!
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Old 01-07-2017, 08:29 AM
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We're they road force balanced?
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Old 01-07-2017, 08:38 AM
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Quote:
Originally Posted by cncmastr View Post
We're they road force balanced?
What do you mean 'road force balanced'? Never heard such terms. Rims are BMW OE Y-spoke 214 migrated from an X6 owned by a friend of mine, hub centric rings used for front only, no needed for rears. Tires are well balanced, brake discs and brake pads are also BMW OE parts. As all stuff are BMW OE parts, so I don't think it is caused by discs or pads or rims. Is that possible caused by front ball joints or bushings?
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Old 01-07-2017, 09:46 AM
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hunter makes a wheel balancing system that mimics real world driving to identify and eliminate causes of vibration due to improperly balanced wheels and tires. BMW uses hunter systems at the facotry and in the dealerships.

It's one thing the mount and balance the wheels but unless you road force balance them you will never know if the wheel is truly balanced.

Hunter GSP9700 Wheel vibration Control System solves wheel vibration and tire pull problems that balancers and aligners can't fix
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Old 01-07-2017, 09:52 AM
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I think it's your thrust arm, which contains a bushing that goes bad. I experienced a rough vibration on the passenger front when braking between 40 and 60 mph. Even light braking caused the vibration. Clamp a vice grip and see if they can be moved. It should be difficult. Look up thrust arm or tension strut in the Bentley service manual.


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Old 01-07-2017, 10:06 AM
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Quote:
Originally Posted by DougPEX5 View Post
I think it's your thrust arm, which contains a bushing that goes bad. I experienced a rough vibration on the passenger front when braking between 40 and 60 mph. Even light braking caused the vibration. Clamp a vice grip and see if they can be moved. It should be difficult. Look up thrust arm or tension strut in the Bentley service manual.


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Thanks for comment! I will replace the push rod (the thick one) and the control arm (the thin one). As I know it will be very difficult to remove the ball joint that connects to the push rod, so I think I will leave it to see if the vibration solved after replacing the control arm (the thin one), if not then I will try to replace the ball joint and the push rod.
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Old 01-07-2017, 10:06 PM
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Quote:
Originally Posted by rogerkiu View Post
Thanks for comment! I will replace the push rod (the thick one) and the control arm (the thin one). As I know it will be very difficult to remove the ball joint that connects to the push rod, so I think I will leave it to see if the vibration solved after replacing the control arm (the thin one), if not then I will try to replace the ball joint and the push rod.
Removing the ball joint from the Thrust Arm (Push Rod) is not that hard if you have the right tool.

https://www.youtube.com/watch?v=7_ekrGlb6To

https://www.youtube.com/watch?v=_mipOFv7ePU
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Old 01-08-2017, 02:57 AM
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Yes the thrust arm bushing is a leading candidate for this.

The control arm bushing can also cause it.

I have had shaking caused by both.

Given how cheap those parts are there in HK, I'd probably replace both and the hub ball joint too for a complete suspension refresh.
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Old 01-08-2017, 05:47 AM
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Quote:
Originally Posted by upallnight View Post
Removing the ball joint from the Thrust Arm (Push Rod) is not that hard if you have the right tool.

https://www.youtube.com/watch?v=7_ekrGlb6To

https://www.youtube.com/watch?v=_mipOFv7ePU
I have the tool to press out the joints, but the guide joint is another story.
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