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Air Suspension

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Judy K
Reg. Dec 2005
Posted 2010-12-01 9:43 AM (#127673)
Subject: Air Suspension


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Location: Grant Twp., MI
Hi - I'm looking for those of you that pull with medium duty trucks - I have a "new to me" International 4400 - has the factory air suspension....but when I shut down the truck and leave it - after about 36 hours it seems to go "flat" and "sits" on the rear tires...I've had it in to 2 different places checking for air leaks and they say its OK - but other's have said it shouldn't do that....it has air ride cab, seats and air bed....and 1 mechanic said it was pre-set from the factory at 90psi - at the compressor - it has the split air hydraulic brake system....any suggestions would be helpful!!!  THANKS IN ADVANCE FOR THE GREAT ADVICE!! 
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wyndancer
Reg. Apr 2007
Posted 2010-12-01 11:27 AM (#127681 - in reply to #127673)
Subject: RE: Air Suspension


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There has to be a leak in either a line or a valve.
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PaulChristenson
Reg. Jan 2007
Posted 2010-12-01 2:10 PM (#127685 - in reply to #127673)
Subject: RE: Air Suspension


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Originally written by Judy K on 2010-12-01 9:43 AM

Hi - I'm looking for those of you that pull with medium duty trucks - I have a "new to me" International 4400 - has the factory air suspension....but when I shut down the truck and leave it - after about 36 hours it seems to go "flat" and "sits" on the rear tires...I've had it in to 2 different places checking for air leaks and they say its OK - but other's have said it shouldn't do that....it has air ride cab, seats and air bed....and 1 mechanic said it was pre-set from the factory at 90psi - at the compressor - it has the split air hydraulic brake system....any suggestions would be helpful!!!  THANKS IN ADVANCE FOR THE GREAT ADVICE!! 


How old is the system?
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PaulChristenson
Reg. Jan 2007
Posted 2010-12-01 2:16 PM (#127686 - in reply to #127673)
Subject: RE: Air Suspension


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Depending on how they piped the air system for the suspension, you might want to check this recall... http://www.automotix.net/autorepair/recalls/15651-recall/
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Judy K
Reg. Dec 2005
Posted 2010-12-01 5:56 PM (#127695 - in reply to #127673)
Subject: RE: Air Suspension


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Location: Grant Twp., MI
Hi Paul - thanks - but it is a 2003 - has the DT 530 motor....I did check but didn't see any signs of air leaks...(I sprayed soapy water and watched for bubbles) - but I did notice today that the driver's air seat bag was making a small hissing noise and when I wiggled and pressed the connection tighter it would stop hissing - but I wouldn't think that would make the whole truck bed sag....any more ideas?  Thanks again for the help.
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PaulChristenson
Reg. Jan 2007
Posted 2010-12-01 6:07 PM (#127696 - in reply to #127695)
Subject: RE: Air Suspension


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Originally written by Judy K on 2010-12-01 5:56 PMHi Paul - thanks - but it is a 2003 - has the DT 530 motor....I did check but didn't see any signs of air leaks...(I sprayed soapy water and watched for bubbles) - but I did notice today that the driver's air seat bag was making a small hissing noise and when I wiggled and pressed the connection tighter it would stop hissing - but I wouldn't think that would make the whole truck bed sag....any more ideas?  Thanks again for the help.
Depending on how the system is plumbed...it could be a leak anywhere in the system will completely drain the whole system...

Edited by PaulChristenson 2010-12-01 6:08 PM
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