Rear Air Bags Not Inflating Properly

[ncrowley]

I have a 2004 Newman on a Freightliner chassis. When I air up, the rear bags are showing that they are aired up but they are not. Lots of bouncing.... I have to partially dump the air and then air up again and all is fine.

Does anyone know what could cause this and how to fix it?

[KawiVoyager]

Probably your leveling valve. On the air ride trucks my company has they seem to be the usual culprit when the bags won't fill.

[charlie_good_ti]

If no leaks in air bags your ride height valve might be mal funching.Might just need joints freed up from corosion making them stiff .This is assuming that valve has a proper supply of air .