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Low air warning pressure switch

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by B5love08, Mar 4, 2024.

Page 1 of 3
  1. Mar 4, 2024 #1
    B5love08

    B5love08 Light Load Member

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    Not sure if I’m posting in correct place but looking for the location of the low air warning pressure switch on a 1999-2000 freightliner FL-112. Last 6 of vin is A89035.

    thank you
     
    B5love08, Mar 4, 2024
    B5love08, Mar 4, 2024
    #1
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  3. Mar 4, 2024 #2
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Behind the pedals in the air mainfold.

    Be easy on the tags and you might can still read what each switch is for.
     
    Last edited: Mar 4, 2024
    Big Road Skateboard, Mar 4, 2024
    Big Road Skateboard, Mar 4, 2024
    #2
    Heavyd and Rideandrepair Thank this.
  4. Mar 4, 2024 #3
    Rideandrepair

    Rideandrepair Road Train Member

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    If it’s not there. Might be on the parking brake. About the size of an old standard round emergency flasher. Should say NC on it. Maybe NC65. Normally closed, opens at 65lbs.
     
    Rideandrepair, Mar 4, 2024
    Rideandrepair, Mar 4, 2024
    #3
  5. Mar 4, 2024 #4
    SmallPackage

    SmallPackage Road Train Member

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    On that “Business Class” cab they are usually behind the center instrument cluster on a manifold mounted on the bottom of the dash above the peddles. Cannot be accessed at all from underneath.
     
    SmallPackage, Mar 4, 2024
    SmallPackage, Mar 4, 2024
    #4
    Rideandrepair Thanks this.
  7. Mar 4, 2024 #5
    B5love08

    B5love08 Light Load Member

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    go I have to disconnect all the air lines going to air gauges to remove cluster enough to get hands down in there??? Oh man lol that’s going to suck
     
    B5love08, Mar 4, 2024
    B5love08, Mar 4, 2024
    #5
    Rideandrepair Thanks this.
  8. Mar 4, 2024 #6
    B5love08

    B5love08 Light Load Member

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    Nov 20, 2019
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    And chance this is it? Attached to the maxi release knob
     

    Attached Files:

    B5love08, Mar 4, 2024
    B5love08, Mar 4, 2024
    #6
    Rideandrepair Thanks this.
  9. Mar 4, 2024 #7
    SmallPackage

    SmallPackage Road Train Member

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    Marion Texas
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    Shouldn’t have too. The air lines and oil pressure line are long enough on mine to pull it to the steering wheel. The oil pressure line is coiled brown plastic hose so it had a little more play on its side of cluster.
     
    SmallPackage, Mar 4, 2024
    SmallPackage, Mar 4, 2024
    #7
    Rideandrepair Thanks this.
  10. Mar 4, 2024 #8
    B5love08

    B5love08 Light Load Member

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    I posted a picture above, any chance I could luck out and that be it? Before I try to remove dash and look down inside
     
    B5love08, Mar 4, 2024
    B5love08, Mar 4, 2024
    #8
    Rideandrepair Thanks this.
  11. Mar 4, 2024 #9
    SmallPackage

    SmallPackage Road Train Member

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    Marion Texas
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    That may be it unless it is just a switch to activate the warning light on dash to let you know the brakes are set. Some had that as option.
     
    SmallPackage, Mar 4, 2024
    SmallPackage, Mar 4, 2024
    #9
    Rideandrepair Thanks this.
  12. Mar 4, 2024 #10
    B5love08

    B5love08 Light Load Member

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    Nov 20, 2019
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    I noticed the connectors were kind of pulled off the sensor and I pushed them back on tight so maybe the light and buzzer will go off. If not guess I’m pulling the dash apart again to look for the manifold. When I looked in there today there was wires and stuff every where and going to have to move a lot I think to expose manifold
     
    B5love08, Mar 4, 2024
    B5love08, Mar 4, 2024
    #10
    Rideandrepair Thanks this.
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