air shocks on 2004 Cadillac Escalade EXT

When do i know when my air shocks have been worn out?

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1 answer 1 comment
The air diaphragm will leak and will not support the vehicle properly. It will lean to one side or squat in the rear. Also, they can leak down overnight an the vehicle will be sitting too low.
The reason im saying is because i recently changed my rear shocks and my compressor and wasted almost $2,000 because the rear shock was leaking air and was making my compressor work all the time and burned it so i was just wondering cause the front ones dont look like its connected to the compressor but they do have a plug in on top of it and i was just wondering how i could tell those are wore out cuz they cost almost $400 each and i dont want to change something i dont need to change