Brake light switch

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by spindrift, Mar 20, 2020.

  1. spindrift

    spindrift Road Train Member

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    Trying to locate the brake light switch on a 2004 Pete 379. Lights won't go off when truck is off, or running.
     
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  3. truckdriver31

    truckdriver31 Road Train Member

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    brake light switch is around brake pedal. try putting ur toes under pedal and pulling up.
     
  4. spindrift

    spindrift Road Train Member

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    The only thing I see under the pedal is a "plunger" that's inside of what appears to be a rubber donut. That assembly is bolted to the floor where it connects to an air valve on the underside of the floor.

    I had aired down the truck to get a better look at what's under the pedal. Odd thing was that the cruise control set switch was very lazy increasing engine speed in order to get air pressure back up. Now, when I turn off cruise, engine rpms do not drop. Another way to turn off the cruise has been to depress the clutch pedal. That method no longer works. Are cruise control and brake lights somehow connected?
     
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  5. DmitriyKW

    DmitriyKW Bobtail Member

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    I think brake light switch is located in your dash where your gauges are and it works by air, you press a pedal and you trigger that switch. Google how it look like. When you press pedal you can hear it clicks each time you press. If not then it got stuck in one position.
     
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  6. spindrift

    spindrift Road Train Member

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    Well...
    Let me say this about that. Sometimes, it's the simple things in life. Wait for it....







    The Johnny bar was pulled ever so slightly!!
     
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