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Shock makes a hissing noise when I go over a speedbump..

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Old 06-30-2009, 09:59 AM
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I've noticed that my front shocks make a slight noise like some of the air or gas inside them is being release when I go over a speedbump. Do you guys hear this or is it leaking?
Old 06-30-2009, 10:03 AM
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I have this too in all of my cars. I think it is just air escaping from underneath the tire which momentarily changes shape when it hits the bump. Any one?
Old 06-30-2009, 10:08 AM
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I think you're hearing the fluid in the shocks passing through the orifices in the dampener at pressure. This is a good thing! Means they're working.
Old 06-30-2009, 10:11 AM
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Blown shock maybe? Is there any change in the ride? Bumpier perhaps?
Old 06-30-2009, 10:11 AM
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yea, i hear the same thing sounds like an air pump
Old 06-30-2009, 10:27 AM
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are they gas or hydraulic fluid in these shocks? mine do the same
Old 06-30-2009, 10:30 AM
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I have almost new KW Street Comfort coilover set and all shocks make a hissing sound. And the car just passed the annual inspection where they told me that shocks are in 100% shape.
Old 06-30-2009, 10:37 AM
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Originally Posted by BLooD' post='928728' date='Jun 30 2009, 01:27 PM
are they gas or hydraulic fluid in these shocks? mine do the same
Both. Some shocks are nitrogen filled. The nitrogen keeps the fluid from foaming under extreme use.
If they are leaking, the nitrogen would be long gone, and fluid would appear on the outside of the struts.
Old 06-30-2009, 12:28 PM
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its normal, my bilsteins do this to ever since day one as did my oem shocks.
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