The leak may be your shock absorber. The pop could be ball joint or tie rod end. Get under it and shake things and look for movement. Make sure it's well supported on jack stands first.
Bad solenoid, leaking bags
A possible cause for this is that air suspension pump is continully working due to a leaking air bag
Back of what? If your speaking of an automobile, it could be because something heavy is in the back or the suspension is worn out.
Could be something simple like a low tyre pressure OR mismatched tyre sizes across the car. Could be something bent in the steering/suspension you will need a tyre and suspension service technician to give the car a -Wheel Alignment Check-
leaking what??
It could be the shocks/struts or something in the steering system...have it checked out.
It depends on why it failed. It should tell you right on your suspension check sheet. If your suspension is failing it is a numerous amount of components that are involved. The compressor could be shot, the air bags could be leaking, your solenoids could need replacing, the air lines could have leaks or holes in them, the dryer could need replacing, your relay could have issues. There are so many things that could go wrong with this and the cost to replace these items can be costly. edit: these are all for electronic/hydraulic controlled suspension systems, these are only on high end cars. On most cars, a failed suspension check would most commonly be caused by failing shock absorbers or ball joints. Though other parts also will fail, it is much less common they do.
I'm pretty sure all expeditions came equipped with rear air ride suspension. meaning that there is a malfunction with the air suspension. could be anything with it including: switch is turned off, level sensor failed, air lines or air bags leaking, air pump failure, blown fuse.
Check your owners manual. If you don't have one copy & paste this link. http://www.genuineservice.com/genuineservice/en/gloveboxresults ---------------------------------- a malfunction has been detected with the air suspension system It could mean a number of things, air compressor could be bad, soleniod could be bad, bags could be leaking -- Call Strutmasters they are ready and willing to help you get ride of this problem you are having.
It is probably a verb. If it describes something like "it was a leaking can" then it could be an adjective because it describes what kind of can.
Your engine may have a leaking hose connection or a leaking gasket at the water outlet. It could also be a leaking hose.
Are the rear brakes working normally?