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!! 

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.