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2016 Peterbilt 579

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Shane1993, Apr 24, 2025.

  1. Apr 24, 2025 #1
    Shane1993

    Shane1993 Bobtail Member

    2
    1
    Oct 17, 2015
    Texas
    0
    Anyone have a service manual for a 2016 Peterbilt 579? Pretty sure my brake pedal switch is back because I have no cruise control or Jake brake. I can still idle the truck up with the cruise control. They would work intermittent but now nothing. I looked around the pedal and all I see is something going through the firewal and I see what might be a switch higher up but didn’t want to tear into the dash more. I found three switches in the engine Bay Area. My break lights will stay dimly lit after turning off the truck for a bit as well. My scanner won’t tell me what switch is bad.
     
    Shane1993, Apr 24, 2025
    Shane1993, Apr 24, 2025
    #1
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  3. Apr 25, 2025 at 3:13 PM #2
    LongHaulTrailer

    LongHaulTrailer Bobtail Member

    13
    13
    Jul 4, 2024
    Saraland, Alabama
    0
    I can't remember which color it is but it's a 1/4" air line that goes from the manifold on the firewall into the dash. The sensors are labeled from the factory so unless it's been replaced, it should still tell you which is which. They should be accessible behind the lower panel behind the steering wheel.
     
    LongHaulTrailer, Apr 25, 2025 at 3:13 PM
    LongHaulTrailer, Apr 25, 2025 at 3:13 PM
    #2
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