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ABS valve leaking

Discussion in 'Freightliner Forum' started by thecubantrucker, Aug 12, 2019.

Page 1 of 2
  1. Aug 12, 2019 #1
    thecubantrucker

    thecubantrucker Light Load Member

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    ok guys 2002 freightliner century my abs modulator under 5th wheel is leaking from bottom and when my yellow valve inside the truck is pushed in it is leaking as well if I apply service breaks leak stops or if I pop the valve off it stops completely any ideas would he appreciated I'm looking my head also what is a maxi pot
     
    thecubantrucker, Aug 12, 2019
    thecubantrucker, Aug 12, 2019
    #1
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  3. Aug 12, 2019 #2
    Lysdexis

    Lysdexis Road Train Member

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    You'll need a new valve. They arent rebuildable. The front one on my international was just over 600 bucks.
     
    Lysdexis, Aug 12, 2019
    Lysdexis, Aug 12, 2019
    #2
  4. Aug 12, 2019 #3
    Lysdexis

    Lysdexis Road Train Member

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    Actually ignore what I said. Check your brake chambers. It seems that one might be leaking internally and that's pushing air back through the abs valve
     
    Lysdexis, Aug 12, 2019
    Lysdexis, Aug 12, 2019
    #3
    gentleroger Thanks this.
  5. Aug 13, 2019 #4
    JohnnyC

    JohnnyC Light Load Member

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    Feb 17, 2009
    virginia beach, virginia
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    Mine was a bad valve. It was @ $100.00 from Freightliner. It’s called a relay valve if its the same one.
     
    JohnnyC, Aug 13, 2019
    JohnnyC, Aug 13, 2019
    #4
  7. Aug 13, 2019 #5
    stayinback

    stayinback Road Train Member

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    Nope- Its not the same one-
    The one he's talking about is a MONSTER.....About 6 inches by 6 inches by 5 inches thick...Plus it has the Modulator on top.....About 7-8 lines go to it.

    Relay valves are on the Frame generally,or hiding under crossmembers....

    The Valve he's talking about is the biggest one the truck,next to the TPV.
     
    stayinback, Aug 13, 2019
    stayinback, Aug 13, 2019
    #5
  8. Aug 13, 2019 #6
    JohnnyC

    JohnnyC Light Load Member

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    virginia beach, virginia
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    Got it
     
    JohnnyC, Aug 13, 2019
    JohnnyC, Aug 13, 2019
    #6
  9. Aug 13, 2019 #8
    thecubantrucker

    thecubantrucker Light Load Member

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    I miss quoted it is the relay valve that is under the fifth wheel big center valve and 2 smaller ones att ched to it
     
    thecubantrucker, Aug 13, 2019
    thecubantrucker, Aug 13, 2019
    #8
  10. Aug 13, 2019 #8
    thecubantrucker

    thecubantrucker Light Load Member

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    two little ones are attached to that one
     

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    thecubantrucker, Aug 13, 2019
    thecubantrucker, Aug 13, 2019
    #8
  11. Aug 13, 2019 #9
    JohnnyC

    JohnnyC Light Load Member

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    Feb 17, 2009
    virginia beach, virginia
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    The two little ones unbolt from the big one. The big one is about $100.00 at Freightliner. I replaced mine about a month ago. Take the fifth wheel off it makes it much easier. Couple hours at most.
     
    JohnnyC, Aug 13, 2019
    JohnnyC, Aug 13, 2019
    #9
  12. Aug 16, 2019 #10
    gentleroger

    gentleroger Road Train Member

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    If it's leaking from the purge valve then you probably have a bad brake chamber
     
    gentleroger, Aug 16, 2019
    gentleroger, Aug 16, 2019
    #10
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