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D3 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc.

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  #1  
Old 12th June 2021, 08:14 AM
Prefferle Prefferle is offline
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Default S8 D3 front suspension knocking

Hi folks, more challenges with my much loved S8. For several weeks Iíve been trying to sort out a persistent knock in my front suspension and it only occurs driving on uneven road surfaces and potholes like on country roads. Iím hoping that someone can point me in the right direction. So far Iíve replaced all front top and lower suspension arms and links with Meyle HD, Also replaced complete stabiliser bar with Audi OEM. I have checked the steering ends and checked for play on steering knuckles and rack and all feels tight and the car steers tight with no apparent play.
Still having this rattle! Itís mainly audible with no feel on the steering. My air struts work perfectly up and down smoothly. I was thinking that on a normal car suspension this noise can be a top strut mount or the strut itself but Iím not seeing this sort of strut failure on the forums. Do I need to replace the air struts? Any thoughts on what next would appreciated. Thanks
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Old 12th June 2021, 03:09 PM
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homer simpson homer simpson is offline
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Seems you have replaced most items. I wonder if it is the shock part of the strut?

Does it do it in comfort mode too?
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Old 12th June 2021, 06:09 PM
Prefferle Prefferle is offline
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Originally Posted by homer simpson View Post
Seems you have replaced most items. I wonder if it is the shock part of the strut?

Does it do it in comfort mode too?
Good point! So first drive for the day I donít notice any knocking. Then after driving along for say about 1/2 hour and onwards knocking is certainly present on rough surfaces only. In both comfort and dynamic modes tested.

Iím thinking the knocking is coming from front only but sounds like on both sides. Iím thinking to replace both struts but would hate to invest that much especially as they work perfectly, and not to cure the problem.

The steering ends are tight and I checked virtually everything I could find except engine mounts and struts. Donít feel the knocking in the steering.
Really sounds like a strut tower mount see item-6 on attachment would this cause it?
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Old 13th June 2021, 11:12 AM
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homer simpson homer simpson is offline
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Originally Posted by Prefferle View Post
Good point! So first drive for the day I donít notice any knocking. Then after driving along for say about 1/2 hour and onwards knocking is certainly present on rough surfaces only. In both comfort and dynamic modes tested.

Iím thinking the knocking is coming from front only but sounds like on both sides. Iím thinking to replace both struts but would hate to invest that much especially as they work perfectly, and not to cure the problem.

The steering ends are tight and I checked virtually everything I could find except engine mounts and struts. Donít feel the knocking in the steering.
Really sounds like a strut tower mount see item-6 on attachment would this cause it?
They are only £6.19 from Audi so might be worth replacing and see how you get on
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Old 14th June 2021, 10:36 PM
Prefferle Prefferle is offline
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Originally Posted by homer simpson View Post
They are only £6.19 from Audi so might be worth replacing and see how you get on
Thanks Homer,
Jacking up again this weekend will replace tie rods and ends as well as check all bits over again. Bracing myself for possible replacing strutsÖ
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Old 14th June 2021, 11:08 PM
H-M3 H-M3 is offline
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My local Kwikfit has those ramps where they shake the car to see/hear noise, might be worthwhile seeing your local? Obviously donít rely on the spotty teenagers
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Old 19th June 2021, 10:22 AM
Prefferle Prefferle is offline
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Originally Posted by H-M3 View Post
My local Kwikfit has those ramps where they shake the car to see/hear noise, might be worthwhile seeing your local? Obviously donít rely on the spotty teenagers
Now that sounds like a great idea! I have not visited a Kwikfit in years - Iíll check it out and see if they have that system.
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Old 20th June 2021, 10:10 AM
dangerdred dangerdred is offline
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When you replaced the ARB you replaced the drop-links as well?
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Old 5th October 2021, 10:34 PM
Prefferle Prefferle is offline
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Quote:
Originally Posted by dangerdred View Post
When you replaced the ARB you replaced the drop-links as well?
Drop links and complete front stabiliser bar replaced
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Old 5th October 2021, 10:37 PM
Prefferle Prefferle is offline
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Quote:
Originally Posted by Prefferle View Post
Hi folks, more challenges with my much loved S8. For several weeks Iíve been trying to sort out a persistent knock in my front suspension and it only occurs driving on uneven road surfaces and potholes like on country roads. Iím hoping that someone can point me in the right direction. So far Iíve replaced all front top and lower suspension arms and links with Meyle HD, Also replaced complete stabiliser bar with Audi OEM. I have checked the steering ends and checked for play on steering knuckles and rack and all feels tight and the car steers tight with no apparent play.
Still having this rattle! Itís mainly audible with no feel on the steering. My air struts work perfectly up and down smoothly. I was thinking that on a normal car suspension this noise can be a top strut mount or the strut itself but Iím not seeing this sort of strut failure on the forums. Do I need to replace the air struts? Any thoughts on what next would appreciated. Thanks
UPDATE Replaced both front air Struts with Aerosus Sport replacements and the knocking noise Is eliminated. Thanks for all the suggestions
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Batmobile: 2006 S8, D3, 4E 5.2L V10 BSM with (loud) Miltek SS exhaust, Carbon Fibre trim, Alcantara headlining, soft close and keyless entry.
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