There shouldn't be any reason for the shocks to go down unless there is a leak. At least in a short period of time. If the system is bleeding down then there is a leak somewhere and that needs to be addressed.

 

Mine have never leaked the air out. If they did, I'd find the leak and fix it.

 

i've checked mine 4 times this year and they and they havent lost any air. gonna check them again tonite since it is getting colder.

 

It doesn't take much for air to find its' way out of whatever is containing it. Could be from a pinhole in an air line, worn seal somewhere, loose connection, valveor pretty much anywhere in the air system in general. Thishas occured in almost every air equippedtruck I've driven over the years...it happens.

You could use a soapy solution in a spray bottle and spray around all of the hoses, connections, valve etc. to source the leak where you would see smallair bubbles forming. I normally check mine every couple of weeks and adjustif necessary.

Tom