Thread: Air Suspension - slow air leak

Mines playing up again but differently

Suppose time to pull the fuse and see what happens...

Been sitting for four days and measured heights seem all over the place..

It seems leaking air is a common problem.
I have the front only ( left and right ) dropping 15 mm overnight.
This is with the 20 amp engine bay fuse removed.
I'm guessing that since the fuse has been removed, that it is a valve block
leak. If that is correct, where is the valve block and can I test for leak
or would it be an internal leak and just replace?

Thanks
Les

Front valve block is mounted on the inside of the front bumper, driver's side. If you unclip the lower half of the wheel-well lining you should be able to access it.

Cheers,

Gordon

Something still doesn't quite make sense that an air leak is making both front springs drop 15mm. Within the valve body the passages are only open when energized so for both spring to loose air the cross link value would need to be open or both front circuits with a corresponding leak.

"Periodic Re-leveling -
When the vehicle is parked, the air suspension control module 'wakes up' two hours after the ignition was last switched off and then once every six hours (some years this is 24 hours). The vehicle height is checked and if the vehicle is not level within a pre-set tolerance, small downwards height adjustments may be made automatically."

I realize you have pull the 20A fuse but there is also a 5A that feeds the Suspension ECU.

Before you go pulling things apart have you parked the vehicle around the other way (forward in instead of reverse or vise versa)? If re-levelling is the culprit then the rear will drop 15mm overnight. Alternatively you could check the heights after +2 hours, 6 hours and 24 hours to see if there is a gradual drop or one movement in a time period.

Good luck with it.

Is there any way to "stop" the "Periodic re-levelling" such as when I'm camping...I'm not always able to find a piece of level ground and with my roof top tent (and us inside) the car is certainly not level !!! so can I just bypass this process altogether and get on with enjoying my camping ?
It's annoying to find the car almost on it's bump stops after a few days in an attempt to get itself "level"... sometimes I think these cars are just a bit too smart for their own good...

You could pull the suspension fuses ( they may differ between model ,D3/D4/RRS and years ) or find a spot in the loom to put a couple of switches in. Doing this may log fault codes though.

rufusking,

Before i removed the 20 A fuse the car would drop over 24-48 hours on all 4 corners.

I'ii try tonight with the car parked in the opposite direction, ( car parking spot is slopped left to right and front to back).

gghaggis,

Will also attempt to access valve block tomorrow.

Thanks
Les

Originally Posted by gandalf

It seems leaking air is a common problem.
I have the front only ( left and right ) dropping 15 mm overnight.
This is with the 20 amp engine bay fuse removed.
I'm guessing that since the fuse has been removed, that it is a valve block
leak. If that is correct, where is the valve block and can I test for leak
or would it be an internal leak and just replace?

Thanks
Les

Internal leak only,if you pull one apart you will see how it works.
Replacing is the go.

Mine did same as yours a few months ago and replacing it fixed the issue.

But now I have a leak somewhere else,fuse is out at the moment so will see how it is in the morning.