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Pete 579 air control issues

Discussion in 'Peterbilt Forum' started by Rilo72, Mar 16, 2022.

  1. Mar 16, 2022 #1
    Rilo72

    Rilo72 Bobtail Member

    1
    0
    Mar 16, 2022
    0
    I drive a 2020 Peterbilt 579 the air suspension will inflate but, the kingpin release, the air suspension dump, fifth wheel slide, and power divider will not work. I have power to the switches but, there’s no air going to those four components.
     
    Rilo72, Mar 16, 2022
    Rilo72, Mar 16, 2022
    #1
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  3. Mar 16, 2022 #2
    Mr.Silky

    Mr.Silky Bobtail Member

    18
    80
    Apr 6, 2015
    Crossville, TN
    0
    I too have a 2016 Peterbilt 579 and have noticed that until the secondary air is above 100# the air suspension will not inflate. Not sure all the other functions are working when less than 100# but there is definitely a valve somewhere that needs to open before the suspension will inflate. Also interesting, when I park, the suspension will deflate even though the air pressure is still above 100#. I have worked hard on fixing air leaks and it will hold over 75# for a week but the suspension will be down overnight.
     
    Mr.Silky, Mar 16, 2022
    Mr.Silky, Mar 16, 2022
    #2
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