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suspension pump question...

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Old 05-14-2014, 08:44 AM   #1
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Default suspension pump question...

does the air pump ever fail for reasons other than a leak ? And when I say fail I mean that the pump will still run but wont keep the car at height and yellow light comes on. And the year in question is an 06 with sport suspension.
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Old 05-14-2014, 08:52 AM   #2
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If the pump is running and cannot keep the car height consistent, there is a leak somewhere in the system and eventually the pump will fail all together from over working it.
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Old 05-14-2014, 10:02 AM   #3
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System pressure is ~16 bar. If pump can't deliver that pressure it will run until it overheats.
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Old 05-14-2014, 11:01 AM   #4
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Default thats the common scenario...

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Originally Posted by 03_AR_CO View Post
If the pump is running and cannot keep the car height consistent, there is a leak somewhere in the system and eventually the pump will fail all together from over working it.
but I want to know if there are ever just pumps that fail with out a leak as the cause.
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Old 05-14-2014, 11:14 AM   #5
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Sure they can wear out, if you are driving an '04 the pump is 10 years old and should be expected to become weak and wear out over time, and as you suggest no other suspension leaks needed for it to become worn.
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Old 05-14-2014, 11:18 AM   #6
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The piston ring can (does) wear out, then the pump overheats from running constantly. Also there's a reed valve that could fail.
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Old 05-14-2014, 11:21 AM   #7
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You can get a kit from a guy in the UK named "BagpipingAndy" he's on a8parts.com. Last I checked it was about $40 shipped, I understand it takes a week or so to the US.
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Old 05-14-2014, 04:20 PM   #8
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Mine failed a year ago. I replaced it with a $500 one from Germany (e-bay). I have never found a leak. Car never sags, even if sitting for 2 weeks. No leaks from valve block either.
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Old 05-14-2014, 05:01 PM   #9
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#1 failure of the WABCO ECAS pump is one of the magnets breaks free from the motor housing causin slow motof speed and drag. Overheat condition soon follows. You can disassemble and reglue (use JB Weld) the magnet and then add glue to the magnet that is still in place.
2nd common failure mode is a worn puston ring as this is an oil free compressor.
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Old 05-14-2014, 11:55 PM   #10
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Quote:
Originally Posted by mishar View Post
System pressure is ~16 bar. If pump can't deliver that pressure it will run until it overheats.
I didn't realise it was that much. You'd think if you had a leak if you parked somewhere without much background noise you'd hear it hissing out.
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Old 05-15-2014, 06:30 AM   #11
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Quote:
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I didn't realise it was that much. You'd think if you had a leak if you parked somewhere without much background noise you'd hear it hissing out.
I've never heard it (yet) but people say yes, you can hear it.

Pressure is not that high in struts. Just around 4 bar, depending on the load.
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Old 05-15-2014, 04:08 PM   #12
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Default and if a magnet has come off...

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Originally Posted by Mister Bally View Post
#1 failure of the WABCO ECAS pump is one of the magnets breaks free from the motor housing causin slow motof speed and drag. Overheat condition soon follows. You can disassemble and reglue (use JB Weld) the magnet and then add glue to the magnet that is still in place.
2nd common failure mode is a worn puston ring as this is an oil free compressor.
would the compressor shake because it is unbalanced ? The compressor on the 06 in question shakes when it runs...if you look down in there with a light you can see it shaking or vigrating.
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Old 05-15-2014, 05:31 PM   #13
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It is a single cylinder, it can't be balanced. But it shouldn't jump around either. I believe if it can't reach designed speed it would shake more.

Edit: Loose magnet would slow it down, but it is stator (?), it wouldn't cause unbalance.

Last edited by mishar; 05-15-2014 at 05:35 PM.
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Old 05-16-2014, 07:39 AM   #14
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Quote:
Originally Posted by awdinut View Post
would the compressor shake because it is unbalanced ?...
My understanding is that if the magnet separates from the motor housing it grinds against the stator and creates a racket. Vibrating is probably a good indication that your ring is gone and the repair kit would not fix it at that point.
My advice is to either remove the panel to access the fuse and relay and leave it off, or familiarize yourself with accessing the power wire to the compressor, so you can stop the thing from running. This thing is a ticking (vibrating?) time bomb. There is at one case on here somewhere where the temp sensor failed and the compressor caught fire. Someone suggested using "Jack" mode to shut it off but then you can't drive more than 5-10 MPH; and I don't know if that will definitely shut it off.

Here's a thread which includes the place I got mine as well as a great link from Mishar to an SSP which details the system, very interesting reading.

Compressor Autopsy
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Old 05-16-2014, 10:51 AM   #16
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They say NEW, but buying cores says it is rebuilt???
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Old 05-16-2014, 10:55 AM   #17
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Quote:
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They say NEW, but buying cores says it is rebuilt???
If you want they will sell you a rebuilt one for quite a bit less. I tried this without success. Luckily I can put one of these in now in about 30 minutes.

The partially working rebuilt unit was returned without questions for a credit towards the new unit.

Last edited by 05SilverA8; 05-17-2014 at 08:57 PM.
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Old 05-17-2014, 07:37 PM   #18
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A stockpile f core are being gathered so that WABCO Reman Solutions can start a rebuild program. Note that during this phase you could get a new one at the price of a reman unit. This is called "seeding".
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Old 05-17-2014, 07:37 PM
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