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Trailer Brakes Won't Release after letting up on the foot brake pedel

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Pufftrucker, Oct 16, 2018.

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  1. Oct 16, 2018 #1
    Pufftrucker

    Pufftrucker Bobtail Member

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    Oct 16, 2018
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    Trailer brakes wont release after you let up on the foot valve or the Johnny bar replaced every valve on the trailer replaced tractor protection valve and the Johnny bar valve still having issues
     
    Pufftrucker, Oct 16, 2018
    Pufftrucker, Oct 16, 2018
    #1
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  3. Oct 16, 2018 #2
    Pufftrucker

    Pufftrucker Bobtail Member

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    Oct 16, 2018
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    99 peterbilt 379
     
    Pufftrucker, Oct 16, 2018
    Pufftrucker, Oct 16, 2018
    #2
  4. Oct 16, 2018 #3
    AModelCat

    AModelCat Road Train Member

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    Check the exhaust port on the johnny bar. If air can't release out it the brakes will stay on.
     
    AModelCat, Oct 16, 2018
    AModelCat, Oct 16, 2018
    #3
    BoxCarKidd Thanks this.
  5. Oct 16, 2018 #4
    Goodysnap

    Goodysnap Road Train Member

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    Theres also an exhaust port on the front firewall passthrough for the MV3 valve. Have you checked for a brake chamber passing air?
     
    Goodysnap, Oct 16, 2018
    Goodysnap, Oct 16, 2018
    #4
  7. Oct 16, 2018 #5
    Pedigreed Bulldog

    Pedigreed Bulldog Road Train Member

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    Check to see that the trailer brakes aren't trying to cam over, too. Sometimes it's something simple like that...
     
    Pedigreed Bulldog, Oct 16, 2018
    Pedigreed Bulldog, Oct 16, 2018
    #5
    jamespmack Thanks this.
  8. Oct 16, 2018 #6
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Had that happen recently. Hand valve released through an aluminum block valve combination in front of the fire wall. It had a dirt dober mess in the exhaust port. It only did it sometimes but knew it was the tractor by putting a gauge on the trailer service hose. It took several days, off and on to figure it out. Ours was on a Ford so I can not give better information.
     
    BoxCarKidd, Oct 16, 2018
    BoxCarKidd, Oct 16, 2018
    #6
    jamespmack Thanks this.
  9. Oct 16, 2018 #7
    baha

    baha Road Train Member

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    The foot valve can go bad after a num. of years, but ck the ex. port 1st to be sure air can get out?
     
    baha, Oct 16, 2018
    baha, Oct 16, 2018
    #7
    jamespmack Thanks this.
  10. Oct 17, 2018 #8
    JohnC123

    JohnC123 Light Load Member

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    Have seen drivers mix their hoses up...ha,ha
     
    JohnC123, Oct 17, 2018
    JohnC123, Oct 17, 2018
    #8
  11. Oct 18, 2018 #9
    jamespmack

    jamespmack Road Train Member

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    Clevis pins tied up in slack adjusters.
     
    jamespmack, Oct 18, 2018
    jamespmack, Oct 18, 2018
    #9
  12. Oct 18, 2018 #10
    RustyBolt

    RustyBolt Road Train Member

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    And I have mixed their hoses up. :-D
     
    RustyBolt, Oct 18, 2018
    RustyBolt, Oct 18, 2018
    #10
    JohnC123 Thanks this.
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