What would cause air pressure loss in the Secondary System....... ?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by SilverBulletBand, Dec 8, 2021.

  1. SilverBulletBand

    SilverBulletBand Light Load Member

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    2017 Freightliner M2-106 straight truck 115k miles.

    What would cause air pressure loose in the Secondary System after the truck is turned off ?

    The truck looses as much as 50psi in the Seconday system after being turned off for about 1/2 hour ?

    The truck brakes fine now, but drops pressure if you pump the brakes a couple times while sitting still.

    I need to be able to explain to my Manager why it needs to go to the shop. He's not mechanically inclined.
     
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  3. Luwi67

    Luwi67 Medium Load Member

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    Tell him the truck has an audible air leak and you can't tell where it's coming from.
     
    SilverBulletBand Thanks this.
  4. SilverBulletBand

    SilverBulletBand Light Load Member

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    What systems does the Secondary air run ?
     
  5. Ridgeline

    Ridgeline Road Train Member

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  6. SilverBulletBand

    SilverBulletBand Light Load Member

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    Murfreesboro, Tennessee
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