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Old 13th August 2014, 16:35   #21
chris75
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When you buy new dampers you usually get an info sheet with them telling you how to drain your old ones before disposing of them . I was instructed to drill two holes in different positions ; one released the gas and the other drained the oil !
My old dampers at 103k miles had no apparent leaks , but the difference in the return rate , between old and new , after compressing the pistons by hand was very noticeable indeed There seemed to be plenty of oil left in them , but when releasing the gas I just got a very quick "pfft" , so I'm thinking it was gas pressure that had been lost . The car ride was transformed and feels like a new car
Interestingly , one of the 4 new Sachs dampers I bought did not return at all when compressed by hand ; it was duff ECP quickly replaced it without any fuss .
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Old 14th August 2014, 20:26   #22
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Yes it does work, because modern shocks have gas in them as well as oil. Try it for yourself, take a new shock and lean on it and it slowly compresses all the way in then it slowly pushes itself back out.

Then try it with one that's done 100,000+ miles, often it will be juddery or will move freely for a bit then resist. My shocks at 180k just collapsed straight in and stayed there, no gas or oil left in them, and it passed the MOT a month before.
Must be a particular make of shock maybe.
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Old 23rd August 2014, 23:32   #23
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Must be a particular make of shock maybe.
Maybe some shocks are still just oil. All the new ones I've seen are gas and oil, even on my old landy.

I think the gas is supposed to give a quick movement to absorb rough surfaces, and the oil is stiffer and takes on the bigger bumps.

If some do still just have oil then I guess no tendency to spring back out at all. You should still be able to compress and pull them out and feel stiff resistance all the way rather than it gurgling and juddering.
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Old 24th August 2014, 12:41   #24
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Most of the time they leak, but not every time.
With the age of our cars, if you can afford a suspension refresh (bushes, dampers and springs if needed) it'll make a big difference.
It's on the cards for the ZT-T, when I can be without it for a few days!
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Old 24th August 2014, 14:20   #25
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With the age of our cars, if you can afford a suspension refresh (bushes, dampers and springs if needed) it'll make a big difference.

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Old 24th August 2014, 16:23   #26
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Well, I'd rather not spend the money if it's not needed - and I'm not sure that it is.

It just feels like the ride isn't as good as it used to be

Not terrible, not even bad as such, but not as good as it was.
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