When I start the SUV, it doesn't air up, so it rides awful.
My Armada's rear air leveling system is not working. The air bags don't air up. on 2005 Nissan Armada
If your air pump is running, the air bags on a lot of vehicles develop cracks. If you can raise the vehicle allowing the wheels to hang down, the place the rides on the metal part of the strut will be exposed. This part of the airbag collects dirt, moisture, road debris, Etc. After time they develop cracks that will no longer hold air pressure. This is the most common cause of failure.