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2020 579 peterbilt with paccar engine. Brake lights causing engine to not build boost

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Weking, Jan 20, 2021.

  1. Jan 20, 2021 #1
    Weking

    Weking Bobtail Member

    2
    0
    Jan 20, 2021
    0
    I drive a 2020 579 Peterbilt and ever time I touch the foot brake or hand brake the lights come on and stay on which causes the engine to build no boost. The shop has replaced the light switch and brake pedal valve and problem still there. They are planning on changing the TC valve tomorrow. Can someone please help? The brakes have zero pressure on the gauge when this problem occurs so I am leaning electrical. If anyone else has had this problem what fixed it?
     
    Weking, Jan 20, 2021
    Weking, Jan 20, 2021
    #1
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  3. Apr 27, 2022 #3
    Trucker567-19

    Trucker567-19 Bobtail Member

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    Apr 27, 2022
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    Having the same problem with my 2019 567. What did you ever find out on this
     
    Trucker567-19, Apr 27, 2022
    Trucker567-19, Apr 27, 2022
    #3
  4. Apr 27, 2022 #3
    prostartom

    prostartom Light Load Member

    191
    416
    Jun 20, 2014
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    I had the same problem in a 17 Peterbilt with a paccar motor, we replaced the brake pedal valve on the firewall because air was leaking out of it. That did not fix the problem however, it turned out to be some kind of valve up by the front bumper that was bad.

    I believe it was something to do with the ABS system, but I am not real sure. It was bad but the air would find its way back to the pedal valve on the firewall and leak out there.
     
    prostartom, Apr 27, 2022
    prostartom, Apr 27, 2022
    #3
    Trucker567-19 Thanks this.
  5. Apr 27, 2022 #4
    Trucker567-19

    Trucker567-19 Bobtail Member

    2
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    Apr 27, 2022
    0
    This ABS valve caused your brake lights to stay on and not gain boost also?
     
    Trucker567-19, Apr 27, 2022
    Trucker567-19, Apr 27, 2022
    #4
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