On my old fullsize Chevy the front bags leak down when I hit bumps or when I'm bouncing the back. I can't figure out where the air is leaking out. I can leave the truck pumped up for days and it won't leak down at all but as soon as I take off and hit a bump I hear a squeeking sound and it drops down. It really sucks cause it takes a little over 100 psi to get the fron back up since it has a 350 small block. Anyone ever had this happen?