Air Suspension Leveling valve

Well, last week it died on me, under load, luckily it happened about a mile from a Pete dealership. Tried changing it out myself, ended breaking off the leveling arm!!!!, finally, out of hours, right at the Peterbilt parking lot, I threw in the towel. Told them to fix it all and, in the process, install a dump valve and button in the dash.....6 hours of labor and $160 in parts later ($840 total) I got my truck back....

Obviously, the valve had been bad for several months as the ride in the truck has changed dramatically, for the better...I've no doubt it has affected my tire tread life as well....but, and here is the question,

Is there a definitive way to tell if it's going bad???....truck was riding jumpy for months, I just thought it was my worn out tires (still legal, but I know they'll have to be changed by mid summer).....other than that, no warning....

 

Yep, total failure to maintain constant inflation.....but before it failed, I noticed the ride (probably for the last 3-6 months) was jumpy (my guess, it wasn't maintaining paper ride height)...but I just figured it was tire wear.....or bad shocks....until it failed .....