Finding leak in air suspension

snapdragon · #1 15th January 2012, 01:33 PM

Quote:

Originally Posted by Stuarta

Incidentally, I have often noticed a hissing noise from the front when getting out of the car and assumed that it was the system venting pressure on shutdown - I assume then that it's NOT normal?

This is normal, it is compensating for the loss of passenger weight.

http://www.volkspage.net/technik/ssp/ssp/SSP_292.pdf

PsYcHe · #2 15th January 2012, 01:43 PM

Yep.. the hiss when you turn off is normal...

Godders · #3 15th January 2012, 07:34 PM

Quote:

Originally Posted by snapdragon

This is normal, it is compensating for the loss of passenger weight.

http://www.volkspage.net/technik/ssp/ssp/SSP_292.pdf

I'm sure I read somewhere (Allroad SSP242, page 47 on - http://www.volkspage.net/technik/ssp/ssp/SSP_242.pdf) that the hiss on shutdown is to blow dried air back through the dryer (dessicant) in the compressor to 'regenerate' it.

PsYcHe · #4 15th January 2012, 07:45 PM

Could be... I thought it was just releasing the pressure in the system to reduce component strain.

Stuarta · #5 16th January 2012, 05:15 AM

'morning all - just had a go at investigating this further - with little luck. Unable to get my trolley jack under the car when it's in the garage (not enough room under the car) so had to place one corner on the kerb to be able to jack it up and remove the wheel - which then forces the system to disable itself (all options greyed out), making troubleshooting somewhat impossible!

I've managed to narrow it down to the front right corner (LHD car) but can't figure out a way to get access with the system activated to look further. Compressor is definitely still going and the only faults recurring are the leak in system and lower limit exceeded.

Any suggestions before I am forced to take her to the stealers?

Cheers.

Stuarta · #6 16th January 2012, 06:32 AM

After some judicious use of jacking mode, kerb corners, various pieces of wood and some ingenuity, I finally managed to get the car raised with the system active to have a look.

The only place I can see bubbles coming from is the red circle - which I believe is the inlet valve? Anyone know how easy it would be to replace just the valve (assuming the part can be found)?

Stuarta · #7 16th January 2012, 10:12 AM

Have managed to find replacement valves here -

http://www.ebay.com/itm/New-Valve-Se...item2c624b4e61

The question remains though about whether it is really a DIY job.

snapdragon · #8 16th January 2012, 01:07 PM

Maybe you can remove and refit yours with a new o-ring?
Looks just like it could be an o-ring or seal problem.
Maybe remove, clean and replace with Loctite pipe-seal would work?