Brake lights won’t shut off

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 85pete359, Jan 12, 2022.

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  1. Jan 13, 2022 #11
    wore out

    wore out Numbered Classic

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    Absolutely they did lmao. Mack’s did as well.

    never over look the simple things
     
    wore out, Jan 13, 2022
    wore out, Jan 13, 2022
    #11
    Oxbow Thanks this.
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  3. Jan 13, 2022 #12
    SmallPackage

    SmallPackage Road Train Member

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    Marion Texas
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    The breakaway stoplight switch is designed to kick on the brake lights if the trailer supply line breaks off and looses psi. It also was wired to light brakes up when parked with key on. Back in the day 99% of them had been disconnected because they would cause light lenses to melt when parked while resting with engine running.
     
    SmallPackage, Jan 13, 2022
    SmallPackage, Jan 13, 2022
    #12
    Oxbow Thanks this.
  4. Jan 13, 2022 #13
    85pete359

    85pete359 Light Load Member

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    Hey brother thanks for coming in on this, i replaced the switch it’s brand new just to make sure and your right I think the air is the issue because I took off the wires to the switch while it’s on the block and it’s still showing a connection with the ohms test so it’s getting air from somewhere and if you remember we spoke a little while back about those airlines I’m pretty sure I got them all back together with the schamatic but I guess I’ll check again but this issue has been since I bought the truck so maybe the previous owner had his hands on the airlines too I’ll give that a check again though
     
    85pete359, Jan 13, 2022
    85pete359, Jan 13, 2022
    #13
  5. Jan 13, 2022 #14
    85pete359

    85pete359 Light Load Member

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    Yes but these lights stay on even when the truck is rolling down the road
     
    85pete359, Jan 13, 2022
    85pete359, Jan 13, 2022
    #14
    SmallPackage Thanks this.
  7. Jan 13, 2022 #15
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Yes like exhaust hoses on valves.
     
    BoxCarKidd, Jan 13, 2022
    BoxCarKidd, Jan 13, 2022
    #15
    wore out Thanks this.
  8. Jan 14, 2022 #16
    rogermunn1

    rogermunn1 Light Load Member

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    Some switches are normally closed and some are normally open ?
     
    rogermunn1, Jan 14, 2022
    rogermunn1, Jan 14, 2022
    #16
  9. Jan 14, 2022 #17
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Yes but I do not want to say what yours should be. I work on many different things and different companies do things different ways. L9000 today with brake warning light on dash. Switches for that are normally closed. Open at about 65 PSI. One of them was bad. I thank a Columbia is normally open. Have to search them out and test them.
     
    BoxCarKidd, Jan 14, 2022
    BoxCarKidd, Jan 14, 2022
    #17
    Oxbow Thanks this.
  10. Jan 15, 2022 #18
    rogermunn1

    rogermunn1 Light Load Member

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    NewBrunswick
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    Mine are fine lol. I was just mentioning it to the poster
     
    rogermunn1, Jan 15, 2022
    rogermunn1, Jan 15, 2022
    #18
  11. Jun 8, 2023 #19
    kevbo7

    kevbo7 Bobtail Member

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    Mar 31, 2021
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    Did you ever figure out why your brake lights wouldn’t turn off? I’m having the same problem.
     
    kevbo7, Jun 8, 2023
    kevbo7, Jun 8, 2023
    #19
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