Freightliner no brake lights

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by MIg25, May 31, 2020.

  1. MIg25

    MIg25 Bobtail Member

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    Apr 10, 2020
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    Hello,
    I have a 2003 Freightliner FL112 Cat C12 engine, Eaton 10SP
    I have no brake light on the tractor.
    I have bypassed the brake switch pedal, still no lights. I am frustrated as I am unable to get power back to those brake lights.
    Any input would be highly appreciated
    Thank you.
     
    Rideandrepair Thanks this.
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  3. Rideandrepair

    Rideandrepair Road Train Member

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    Should be a brake light switch on the parking brake. Look for 2 air switches, 1 controls the low air light/ buzzer, other one controls brake lights. The switches are different, one normally closed, one normally open. They’re marked accordingly. I had more info on them, but it got lost. Maybe someone else has more info, maybe Dealer can help.
     
    PE_T and MIg25 Thank this.
  4. MIg25

    MIg25 Bobtail Member

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    Apr 10, 2020
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    Hello,
    Today I dismantled my dash behind the parking brake and trailer brake switch, that valve has only one switch. I replaced it, as well as the one in the engine compartment.
    Still no brake lights.
    The kit I bought came with three of those air switches, but I dont know where the other ones go. Any hint? I still have no brake lights in my tractor...
     
    Rideandrepair Thanks this.
  5. Rideandrepair

    Rideandrepair Road Train Member

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    I don’t know, myself.My 01 Fld has then on parking brake.
     
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  6. MIg25

    MIg25 Bobtail Member

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    Apr 10, 2020
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    This tractor brake light issue is driving me crazy. I can figure out this crap... Well tomorrow is another day. Hopefully someone else will chime in with some tip or trick.
     
    Rideandrepair Thanks this.
  7. Rideandrepair

    Rideandrepair Road Train Member

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    Maybe there’s another somewhere. Maybe on the brake valve? I’m thinking that’s the one you replaced under the hood? Maybe another instead dash, on or near brake treadle valve. Sure you got the right switches in the right place? Do brake lights come on trailer? Straight Truck? Check the lights at back of frame, maybe. One bad wire, on first light,will cause both to not work.on my bobtail, the others jumped from the first.
     
  8. baha

    baha Road Train Member

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    If you ck. above your brake pedal and look for another 2 wire switch that is on brake line that is leading to the emerg. brake buttons, from foot valve, some year models you must lay across floor and reach up under dash to get it out?
     
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