Freightliner Service Brake

Discussion in 'Trucks [ Eighteen Wheelers ]' started by mrbamcclain, Jan 26, 2014.

  1. mrbamcclain

    mrbamcclain Light Load Member

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    May 25, 2011
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    On my Shaker my cruise won't activate..I've tracked the problem down with Insite to the service brake handle. If it is in the down position meaning activated the cruise will come on, obviously can't drive that way:biggrin_2552:

    Anyone know if this would mean one of the valves are bad in the air manifold or possibly backwards in some crazy way? I've racked my brain and can't figure it out
     
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  3. Pablo-UA

    Pablo-UA Road Train Member

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    may be bad servise brake pedal switch?
     
  4. dude6710

    dude6710 Road Train Member

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    Do your brake lights stay on when pressed?
     
  5. Pablo-UA

    Pablo-UA Road Train Member

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    freightliners have two switches. one on pedal unit, other - pressure switch (used for brake light)
     
    dude6710 Thanks this.
  6. Heavyd

    Heavyd Road Train Member

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    There are separate switches for brake lights and cruise cancellation. The cruise switch is probably stuck.
     
  7. mrbamcclain

    mrbamcclain Light Load Member

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    Hammond, La
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    Yes the brake lights operate properly. The problem is in the service brake handle. If it's in the released position the cruise will not function (jakes operate fine), with the handle in the down position I can operate the cruise switch while sitting for idle setting etc.
    Of course with the switch down it operates the brakes and lights. It's just odd.

    I've checked my clutch switch and it's working (again, the jakes are working, which the clutch switch ties into both systems)
     
  8. mrbamcclain

    mrbamcclain Light Load Member

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    May 25, 2011
    Hammond, La
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    That's what I'm thinking Pablo....can a pressure switch go bad and read backwards? Or quite possibly be the wrong switch in the wrong position? Are all of the switches in the manifold the same and work the same way?

    Also, I'm wondering can I use Calterm to alter the settings of that switch to trick it into operating backwards?
     
  9. Pablo-UA

    Pablo-UA Road Train Member

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    with stuck pressure switch brake lamps are activated, but cruise works
     
  10. mrbamcclain

    mrbamcclain Light Load Member

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    Well I can forget that one because the lights are working fine
     
  11. baha

    baha Road Train Member

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    they make 2 switches, one works one way, the one you are looking are near the brake emer. pull/out inside dash, one is in/on other in/off, get test light behind dash CK. which one lights up.
     
    Last edited: Jan 26, 2014
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