13 speed air lines

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by EzcVNL, Jan 16, 2025.

  1. EzcVNL

    EzcVNL Bobtail Member

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    So I bought an extension for my gear shifter and I bought the air line extension as well. Every video I watched every 13 speed only had 4 air line up to the knob. Mine has 5. Is the 5th airline a back up? Can I leave it unplugged until the other airline gets here?
     
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  3. broke down plumber

    broke down plumber Road Train Member

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    That 5th one is the auxiliary, it should come with a trumpet tip , when , if air pressure drops below operational minimum blow into trumpet mouth piece .
     
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  4. 062

    062 Road Train Member

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  5. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Maybe just a spare? Maybe they just hooked it up because there were 5 ports on the knob?

    I don't think any have 5, but possibly an LL?

    I don't have my computer here, but 13's were 4, 18's only 3 IIRC.
     
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  6. EzcVNL

    EzcVNL Bobtail Member

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    Sep 28, 2024
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    The dealership told me to buy a peterbilt…. lol no but they did tell me that the 5th is an exhaust and I can leave it unplugged. Thanks yall!
     
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