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air coming out of blue trailer hose?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by flc120, Jul 12, 2012.

  1. Jul 12, 2012 #1
    flc120

    flc120 Heavy Load Member

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    Jul 11, 2012
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    im pretty sure the trailer side valve is bad, but with the RED dash trailer button engaged (NOT PUSHED IN) andf with or without tractor brake on or off you hit the foot brake and i get air coming out of the blue side hose that goes to the trailer? this would be a faulty glandhand trailer valve correct not the dash valve?
     
    flc120, Jul 12, 2012
    flc120, Jul 12, 2012
    #1
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  3. Jul 12, 2012 #2
    bender

    bender Road Train Member

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    It would be the tractor protection valve.
     
    bender, Jul 12, 2012
    bender, Jul 12, 2012
    #2
  4. Jul 12, 2012 #3
    flc120

    flc120 Heavy Load Member

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    Jul 11, 2012
    Miami,FL (yeah i know :( )
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    that would be the one mounted inline going to the trailer hosses? under cab in rear? not the ones up on the dash that you push in right.
     
    flc120, Jul 12, 2012
    flc120, Jul 12, 2012
    #3
  5. Jul 12, 2012 #4
    bender

    bender Road Train Member

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    That is correct.
     
    bender, Jul 12, 2012
    bender, Jul 12, 2012
    #4
  7. Jul 12, 2012 #5
    Rif Raf McQ

    Rif Raf McQ Light Load Member

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    May 9, 2012
    Lexington Park, Maryland
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    Is the rubber grommet missing between the glad hands? Is there a kink in the service line or a small hole? Maybe the connection is not all the way tight letting air out as your press the brake pedal
     
    Rif Raf McQ, Jul 12, 2012
    Rif Raf McQ, Jul 12, 2012
    #5
  8. Jul 12, 2012 #6
    bender

    bender Road Train Member

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    The service line to the trailer shouldn't have any air with the red button (trailer charge) out when you depress the service brake pedal.
     
    bender, Jul 12, 2012
    bender, Jul 12, 2012
    #6
  9. Jul 12, 2012 #7
    Pablo-UA

    Pablo-UA Road Train Member

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    Borispol, Ukraine
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    I sugest bad TCV (trailer cointrol valve on truckor) ore bad trailer safety valve (trailer side)

    to check is easy. You need two 200 PSI gauges mounted with glad hands.

    With the red button depressed you are to see min 100 PSI at red hand and zero at blue (yellow) coupling. When you depress brake pedaul fully you are to see 100 PSI min at blue coupling.

    100 PSI is the minimum, 130-140 is normal
     
    Pablo-UA, Jul 12, 2012
    Pablo-UA, Jul 12, 2012
    #7
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