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D4 - Axles, Brakes, Suspension and Steering Brakes, Springs, shocks, steering racks, steering columns, suspension arms, wheel hubs etc.

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  #1  
Old 29th October 2020, 06:49 PM
Slabber Slabber is offline
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Default Thunk from rear going over potholes or bumps

Every time I go over a pothole or a bump in the road I hear/sense a 'thunk' from behind me. My garage have given the suspension a thorough going over and can't find anything wrong. The exhaust seems to be firmly in place. Anything else they could check?
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Old 29th October 2020, 07:12 PM
ainarssems ainarssems is offline
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Rear diff bushes and check if the spare wheel is secured in the boot or any other loose items in boot / spare wheel well.
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Old 29th October 2020, 09:40 PM
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Thanks for that! Spare tyre is definitely secure but rear diff bushes sounds like something that may not have been checked.
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Old 2nd November 2020, 06:47 AM
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Okay, my garage (Audi independent specialist) have now given my car a thorough inspection and can't find anything wrong with the suspension, nor with anything else that might be causing the 'thunk' from the rear. They can hear the thunk though, which is something I suppose. I'm now considering having some rear suspension parts replaced on a speculative basis. Grateful for suggestions as to what to start with!
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Old 28th March 2021, 12:20 PM
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Update to help someone else in the future.

I finally had my garage do an in-depth investigation in to my suspension 'thunk' and it turned out that a new air suspension strut that was fitted last year was faulty: when they took it off (which is a massive job BTW) there was something loose inside. Luckily it was under warranty and even better the manufacturer was happy to accept the warranty claim via a video of the strut making a noise rather than having to ship it to Germany for inspection. New part now fitted and the thunk gone!
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Old 28th March 2021, 05:39 PM
Joe2.0E Joe2.0E is offline
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Glad you got sorted at last.
Was the faulty strut a genuine part or aftermarket ?
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Old 29th March 2021, 12:49 AM
H-M3 H-M3 is offline
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Might be useful for us if you can upload the video of faulty parts
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Old 29th March 2021, 08:46 PM
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Quote:
Originally Posted by Joe2.0E View Post
Was the faulty strut a genuine part or aftermarket ?
Aftermarket. I didn't mention the supplier as I'm not 100% certain (my garage handled everything), although I'm pretty sure there is only one major supplier of aftermarket air suspension parts in Germany. Aftermarket doesn't necessarily mean cheap though: still 550+.
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Old 29th March 2021, 08:47 PM
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Quote:
Originally Posted by H-M3 View Post
Might be useful for us if you can upload the video of faulty parts
I'll check if my garage are happy for me to post it.
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  #10  
Old 4th April 2021, 10:15 AM
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Here's the video! Nothing to see per se - just the noise coming from the strut.
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File Type: mov faulty-air-strut.mov (12.10 MB, 34 views)
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