Brake light switch?

Discussion in 'Ask An Owner Operator' started by bigironoil, Nov 11, 2019.

  1. bigironoil

    bigironoil Bobtail Member

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    Nov 11, 2019
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    Hello all,

    Trying to find out the reason for this switch. As far as I can tell, the only purpose would be to activate the brake lights, for some reason?

    thank you!
     

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  2. ZVar

    ZVar Road Train Member

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    Pretrip? Does it stay on when pushed?
    Also, get tailgaters off without actually slowing the truck, but that's unlikely the designed usage.
     
    Bean Jr. Thanks this.
  3. bigironoil

    bigironoil Bobtail Member

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    Haven't pushed it yet while driving, too scared haha. But I have pushed it when parked and it just activates the brake lights as far as I can tell. Then when the parking brake released, the switch releases also. Quite the conundrum.
     
  4. ZVar

    ZVar Road Train Member

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    Yea, to check your brake lights on your pretrip.
     
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  5. bigironoil

    bigironoil Bobtail Member

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    Huh, I guess that's handy then.
     
  6. "semi" retired

    "semi" retired Road Train Member

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    Don't the brake lights come on with the parking brake on? Maybe this over rides that, like when you're sitting for 2 days. Leave it to Peterbilt, could be handy going around a scale :biggrin_25522:
     
  7. Bean Jr.

    Bean Jr. Road Train Member

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    No, brake lights don't come on when parking brakes are set. If they did every truck in the truckstop would have their brake lights on.
     
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  8. "semi" retired

    "semi" retired Road Train Member

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    Thx, I seem to remember years ago, lots of trucks brake lights were on when parked.
     
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  9. starmac

    starmac Road Train Member

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    They should only come on if the squaw handle is pulled when parked, but it should not be used for a parking brake.
     
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  10. "semi" retired

    "semi" retired Road Train Member

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    Ahem,,squaw handle?:biggrin_2559: You mean the johnny bar? I know that, but it's why you never set the trailer brakes, because the brake lights would come on. Maybe that's changed.
     
    Bean Jr. Thanks this.
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