Buying used suspension air shock - Club Touareg Forums
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post #1 of 17 Old 06-04-2019 Thread Starter
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Buying used suspension air shock

I'm thinking of buying a complete set of used suspension air shocks as spare parts.
My Treg is 135KM and 15 years old. It spends most of the year in the garage and I fear the bags will fail someday without notice when I need them most. I'm keeing this Treg and maybe taking him with me to the other side of life
There are a lot of oem used parts on ebay. The whole set will not go above 200€ including shipping.
What do you guys think?
Is is a good idea to have the shocks/bags ready in the garage in case of need or would you wait for things to go boom. I'm treating the bags like tyre here.
I know I can get new bags on ebay or aliexpress but I'd rather get a used oem part than a shady part. I use shady parts for troubleshooting only.
So can these units be stored cleaned and inflated and maybe in an air tight bag?
Any hints on testing the bags or checking for failure on the used parts?
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post #2 of 17 Old 06-04-2019
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I would just store them in a nice dry place, free from moisture. Only thing special I would do is to clean and wrap each one in a plastic bag.

The only way I know to properly test them is to install them. Yeah, not doing that.
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post #3 of 17 Old 06-04-2019 Thread Starter
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Buying used suspension air shock

Yep. Clean and store in an air-tight bag. Not sure I can inflate/deflate them to make sure the bags hold presssure. I started looking on on ebay today. I found different part numbers. According to etka there have been several upgrades since the treg launch. I will try to get recent parts. I think I can mix parts as I'm not sure of getting the 4 units from the same year/car. And I'm getting them just to be on the safe side. I might not have to use them at all.
The bags are made by Continental according to what I've read on the web and they are specced for 250km or 250 miles I don't recall which.


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post #4 of 17 Old 06-05-2019 Thread Starter
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I guess all shocks are interchangeable for the 2002-2010 Treg? Do you guys confirm?


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post #5 of 17 Old 06-05-2019
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Its a nice idea to keep the old car going and if it was just a metal item then storing something that is already 10 or more years old would be fine but I think the rubber will carry on perishing, get brittle and possibly pop when used again.

So personally I would buy used if and when needed or, preferably, buy new from Arnotts.

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post #6 of 17 Old 06-05-2019 Thread Starter
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Agree on the rubber perishing point.
I'll just treat them like tires, meaning storing them in a dry oxygen-free black bag to minimize the rubber deterioration.
Investment is not that big so I'll take the risk I guess.
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post #7 of 17 Old 06-05-2019
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I have been through this twice... the air bags won’t go bad, but there are two o rings in the system that will. Kind of think of them as a fuse, they will blow before the bags... one is on the shock body and the others is on the top of the airbag assembly. It’s not much work to replace them after you understand them. As always, do what you think is best. I am just repeating my personal experiences....

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post #8 of 17 Old 06-05-2019 Thread Starter
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Thanks for the feedback. I already bought those o-rings. They are in the trunk . Just ordered the rears for 110$ shipped from Germany. I will refurbish them and use them as training material to get ready for any repairs down the road. They came off a 2006 Treg.


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post #9 of 17 Old 06-12-2019 Thread Starter
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Rear shocks received yesterday.
Teardown next weekend.
What do you guys wanna see
Anyone know how to test-inflate?
I don't know anything about this stuff so I'll be learning with a friend who has a 2003 Treg with air suspension too.
We will try to open one shock and refurbish it, renewing o-rings, seals and valves and learning how to troubleshoot this thing.
I read somewhere you can not inflate them easily.
Ideas or feedback on how to test, repair, refurbish and get them ready as a backup solution are welcome.
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post #10 of 17 Old 4 Weeks Ago Thread Starter
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Ok we are testing the shocks. They inflate and deflate correctly through the pressure relief valve. I understand how the relief valve works now. We haven't measured pressure but works like this: you inflate the bag up to about 50 psi and it starts hissing back if the pressure goes beyond that. Not sure of the numbers. So the relief valve accepts any pressure from the outside but only opens up at a certain pressure. That looks simple but well I'm learning There are two passages inside the valve. One in and one out.
Now how does the Treg deflate the bags since the pressure relief valve is a fixed pressure thing and no electronics are involved?
I guess this is done through the cdc valve on the lower part of the shock. I haven't gone through the ssp yet but I will.
Anyone know how to test the bag deflating without the shock connected to the suspension module?
The connector on the cdc valve has two wires. I guess it's some kind of voltage or polaty thing but I don't want to risk damaging the valve.



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