lasvegasbenz

Hello everyone,
This is my first post.

I just noticed that when I drive over a speed bump, I can hear a hissing sound. It is not a constant sound, it sounds more like a bus with air brakes when a bus stops. It only happens when I go over speed bumps.. Im getting ready to go on a 2000 mile roadtrip and of course this happens 3 days before I leave! I took a video you can see here
Also the air pump comes on and runs for about 15 seconds after I hit a bump..

I am leaning towards the air bags on the struts. Has anyone had this problem before? Any help is appreciated,

Thanks

tusabes

Wow never heard of that type of leak

EasyPhil

This might be normal.

https://mbworld.org/forums/s-class-w...shut-down.html

ibeforreal

Your video sounds like air escaping from a hose but the pump is coming on to keep it from lowering. Just a wild guess. Before going on a 2,000 mile trip I would have a dealer or an Indy with a STAR system run diagnostics.

baldsparky

I am no expert but within the system is a pressure relief valve that for example you will here when you raise the vehicle or sometimes when you exit the vehicle.
If that valve was weak then a speed bump could cause a sharp release of air which your compressor would compensate for.
I dont think its a leak as such because the pump runs for a short time and then shuts off, so pressure is building back up.