2016 W900 Brake lights staying on.....

Discussion in 'Trucks [ Eighteen Wheelers ]' started by nikmirbre, Jan 12, 2025.

  1. nikmirbre

    nikmirbre Road Train Member

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    I noticed this summer that sometimes when i press the brake pedal that my lights tend to stay on a few seconds after coming off the pedal. No big deal until today...... now my brake lights are stuck on which is one of the most aggravating things lol.

    Through my research..... my trolley bar is in the correct position and I lift up my brake pedal as far as I can and the lights are still on. I let all of the air out of the truck and the lights go off...... I press the brake pedal when all air in the truck in dispensed and they work normal. Build air back up and they come back on....any help??

    Im no mechanic and I read something about maybe a stuck brake valve? Would that be under the 5th wheel somewhere?

    Also to add...my brake application on the dash is showing about 75 psi(As if im pressing the brake)
     
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  3. kwswan

    kwswan Road Train Member

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    Check to see if the piston in the foot valve is moving freely. It could some dirt keeping it from moving freely. Spray with wd40 & work it up & down.
     
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  4. nikmirbre

    nikmirbre Road Train Member

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    'Will I ned to remove the foot pedal? I cant see behind/underneath it.....
     
  5. nikmirbre

    nikmirbre Road Train Member

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    Also...My cruise controls works fine.
     
  6. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Brake lights work with no air pressure?
     
  7. nikmirbre

    nikmirbre Road Train Member

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    If you are referring to my other post.... I mean there is very little air in there when t=I did that test.
     
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  8. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Yes, sorry I quoted the wrong one. If your application gauge shows zero, and you don't think your brakes are dragging, check your brake light relay.

    That might explain why cruise still works. Brake lights are opeeated by an air switch, so no air should equal no lights.

    900's are bad about getting water into the fuse panel and causing relay issues IME
     
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  9. Banker

    Banker Road Train Member

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    If your pedal is sticking get a can of PB blaster and spray under your foot valve. Then work the pedal over and over and over. Dirt and grime will build up under the pedal causing it to stick. My 2015 has done this twice in the last 9 years. I have a brake application gauge so I can verify that the brake pedal is actually sticking because the gauge showed a little pressure when it happened.
     
  10. nikmirbre

    nikmirbre Road Train Member

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    I have 2 application gauges....one says 0 psi and the other which I assume is for the trailer is reading near 80 psi
     
  11. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Just to verify, can you take a pic of your application gauges? I haven't seen one with 2 that I know of.
     
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