I just purchased brand-new Bellows for the rear of my 2004 Land Rover discovery II. The suspension now inflates and holds whenever I'm driving but at night, it always deflates and when I go out to drive the vehicle in the morning sometimes they inflate and sometimes they don't so I'm just curious what may be the problem? I've found that if I stand on the rear bumper and bounce a little bit that usually does something and causes it to reinflate and then everything is fine. Any ideas?

 

sensors?

 

i would check all the air connections with a bottle of soapy water

 

I'm not familiar with working on rovers yet. Anybody have a diagram of areas to concentrate on when spraying connections?

 

go threw the RAVE and anyplace you a connection spray it, most will be at the control unit & compressor (under the truck just below the seat) and the 4 bags themselves

 

Here is a good overview of the system: Disco II Air suspension – the definitive guide - Land Rover Zone

If both sides are dropping, you may have a bad valve block...

 

Both sides are dropping and the weirdest part is that they sometimes won't re-inflate unless I turn the rover off, leave it sit for a couple of minutes and start again then jump up and down on the bumper a couple of times and when I jump in and sit down in the drivers seat the compressor usually kicks in and it re-inflates.
I'm almost laughing because it's like trying to figure out a puzzle of things to do to get stuff on this rig to work properly.
I've got another thread about my drivers side speakers cutting out when I'm driving and the ONLY way they will come back on is if I shift into neutral and then back into drive and then the speakers comes back on.....You've got to love a LandRover I guess.

 

The compressor is attached to the chassis about under the driver's seat. It's in a box about 12"x6"x6" with 2x zeus quarter turn screws. You'll see the plastic pipes going in and out of the comp: unit so spray around them with the engine running. I believe there may also be an NRV (non return valve) somewhere and it may have dirt or corrosion in it.

There is also an intake filter behind the drivers side rear light, you have to remove the light unit to access.

PS just reread your post, spray around the connections going into the suspension airbags as well. Who fitted the airbags and what type of connector were they, there are 2 types, push fit and screwed olive.