Possible air leak, where do I start?

Darius · #1 8th April 2016, 06:33 PM

So, Ive noticed that the rear drivers side corner drops a little overnight. After leaving the car for more than 48 hours, I think passengers side drops a bit too. Where do I start looking for this air leak? I have read about using soapy water, but will this help me find what seems to be a very small leak?
Also, few weeks ago I tried to calibrate suspension with no luck, after car is restarted it goes back to normal. Wonder if this has anything to do with this leak? Any help would be appreciated.

Delboy · #2 8th April 2016, 08:01 PM

Try using VCDS to jack the offending axle to the max pressure allowed for that axle and then use soapy spray on connections and around the struts.

Use the label file from this thread to assist you

Darius · #3 8th April 2016, 08:06 PM

And I thought I searched a lot before asking the question. Thanks! Will give it a go tomorrow hopefully.

Delboy · #4 8th April 2016, 08:16 PM

If you skip to 11:18 in this video you can see how the charging of the axle is done and what to look at etc.

https://www.youtube.com/watch?v=OU5SBmHQIfI

Just remember thats the front axle in the video

Darius · #5 9th April 2016, 07:06 PM

Well I had a go today, but no luck finding it. Is there anywhere else I could look for it? The only thing that keeps bugging me is what if the leak is at other side of the air bag? Frustrating this

Delboy · #6 9th April 2016, 07:29 PM

Have you had the arch liner passenger side and soaped up the valve block?

Darius · #7 9th April 2016, 08:16 PM

Wasn't aware of this valve block, I only did drivers side as thats where it drops overnight. Another job for tomorrow I guess. Is it easy to get to?

Delboy · #8 9th April 2016, 08:54 PM

Yeah it's not too bad, whip the front wheel off the remove or peel open the rear half of the liner, the valve block is up in the corner near the bulkhead

The thing at the edge of this picture with the different coloured lines is what you need to spray on.

Darius · #9 10th April 2016, 08:45 AM

Thanks, I don't think Ill manage to do that today, will have to be next Saturday job.

Delboy · #10 10th April 2016, 10:22 AM

Its not a bad job take you about an hour tops from start to finish.

Its the passenger side front wheel on a RHD car.

Page 184 of this manual for instructions