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Spring brake check valve

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Steve from hutch, Dec 4, 2023.

Page 1 of 2
  1. Dec 4, 2023 #1
    Steve from hutch

    Steve from hutch Medium Load Member

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    Oct 22, 2017
    Hutchinson, Ks and Woodland Hills, Ca
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    I have a 2005 Peterbilt 387, doing a pre-trip I found a valve at the trailer brake hoses leaking. This valve I think a check valve? I have not found a direct replacement by the key word search I have done, it is straight through 1/2' FPT both sides. PXL_20231204_180809783.jpg PXL_20231204_180832126.jpg
     
    Steve from hutch, Dec 4, 2023
    Steve from hutch, Dec 4, 2023
    #1
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  3. Dec 4, 2023 #2
    xsetra

    xsetra Road Train Member

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    Is this part of the truck the pigtail or the trailer?
     
    xsetra, Dec 4, 2023
    xsetra, Dec 4, 2023
    #2
  4. Dec 4, 2023 #3
    Steve from hutch

    Steve from hutch Medium Load Member

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    Hutchinson, Ks and Woodland Hills, Ca
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    This is part of the truck, it has a black plastic sleeve over the middle and it was just below the deck plate where the air line connects.
     
    Steve from hutch, Dec 4, 2023
    Steve from hutch, Dec 4, 2023
    #3
  5. Dec 4, 2023 #4
    Steve from hutch

    Steve from hutch Medium Load Member

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    Oct 22, 2017
    Hutchinson, Ks and Woodland Hills, Ca
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    Just blew up the pic, it is a Norgreen fast brake valve
     
    Steve from hutch, Dec 4, 2023
    Steve from hutch, Dec 4, 2023
    #4
  7. Dec 4, 2023 #5
    kylefitzy

    kylefitzy Road Train Member

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    It’s a service line quick release to allow trailer brakes to release faster. IMG_6240.png
     
    kylefitzy, Dec 4, 2023
    kylefitzy, Dec 4, 2023
    #5
    Bean Jr., Big Road Skateboard and JB7 Thank this.
  8. Dec 4, 2023 #6
    Lyle H

    Lyle H Road Train Member

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    That valve, I believe, should only exhaust air when you take you foot off the pedal after a brake application.
    It helps exhaust air out to let your brakes release quicker after applying them.
    If it leaks constantly, you are getting feedback somehow through the air system.
    Most likely a brake can leaking.
     
    Lyle H, Dec 4, 2023
    Lyle H, Dec 4, 2023
    #6
    Bean Jr., Big Road Skateboard and JB7 Thank this.
  9. Dec 4, 2023 #7
    Steve from hutch

    Steve from hutch Medium Load Member

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    Oct 22, 2017
    Hutchinson, Ks and Woodland Hills, Ca
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    This was on the supply line red hose, it was leaking with the tractor and trailer brake vaves pushed in, no brake pedal application. Your comment points to a trailer spring brake issue?
     
    Steve from hutch, Dec 4, 2023
    Steve from hutch, Dec 4, 2023
    #7
  10. Dec 4, 2023 #8
    Lyle H

    Lyle H Road Train Member

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    Have you pulled this trailer before?
     
    Lyle H, Dec 4, 2023
    Lyle H, Dec 4, 2023
    #8
  11. Dec 4, 2023 #9
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    If it's on the red side and leaks when released, it's bad. Some trucks have them on supply and service side, but usually only service
     
    Big Road Skateboard, Dec 4, 2023
    Big Road Skateboard, Dec 4, 2023
    #9
    Bean Jr., Goodysnap and JB7 Thank this.
  12. Dec 4, 2023 #10
    Lyle H

    Lyle H Road Train Member

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    This is what I found… IMG_3654.jpeg
     
    Lyle H, Dec 4, 2023
    Lyle H, Dec 4, 2023
    #10
    Bean Jr., BennysPennys, Concorde and 1 other person Thank this.
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