Junior9009 Posted September 6, 2016 Share Posted September 6, 2016 (edited) I was doing some work on my 89 R model today and realized my rear cab airbags aren't solid. Made sure I had enough air in the tanks but quickly ruled that out. The one on the left had a small leak at the base but they should still hold air correct? Edited September 6, 2016 by Junior9009 Quote Link to comment https://www.bigmacktrucks.com/topic/46727-cab-air-bags-seem-deflated/ Share on other sites More sharing options...
gearhead204 Posted September 6, 2016 Share Posted September 6, 2016 Take one end of the linkage loose that controls the leveling valve and move the lever by hand and you should see the bags air up or hear them deflate. if this does not happen trace the supply air line from the valve until you find the problem. Mine won't air up until I get to about 85 psi on the dash gauge. I think the supply line is attached to a pressure protection check valve if I remember right, it may be plugged. Quote Link to comment https://www.bigmacktrucks.com/topic/46727-cab-air-bags-seem-deflated/#findComment-344821 Share on other sites More sharing options...
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