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Found the air leak

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Rudy5, Mar 25, 2013.

  1. Mar 25, 2013 #1
    Rudy5

    Rudy5 Light Load Member

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    Mar 17, 2013
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    Finally found where that hissing sound was coming from on my 97 peterbilt. It was beneath the ignition and looks like some sort of check valveour sensor. Part number is 0620 B76577 4. It had 2 writes connected to it and also had a plastic cone looking back that was hissing air. i will try and post a picture of it. Does anyone have a clue what this might be? And moreover, what is the price tag for such a piece? Thanx again IMAG0599.jpg everyone
     
    Rudy5, Mar 25, 2013
    Rudy5, Mar 25, 2013
    #1
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  3. Mar 25, 2013 #2
    Heavyd

    Heavyd Road Train Member

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    If it came from a block with air pressure all the time, it could be the low air warning switch. Switches like these are also used for brake lights, and cruise cancel switches as well.
     
    Heavyd, Mar 25, 2013
    Heavyd, Mar 25, 2013
    #2
  4. Mar 25, 2013 #3
    Rudy5

    Rudy5 Light Load Member

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    Mar 17, 2013
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    Yeah I took it off an aluminum block bout 1 1/2''. Seem to leak only when I release the rachelle breaks
     
    Rudy5, Mar 25, 2013
    Rudy5, Mar 25, 2013
    #3
  5. Mar 25, 2013 #4
    Heavyd

    Heavyd Road Train Member

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    If it only leaks with brakes released that could simply be your park brake warning light. Detroit engines also needed one to kick out PTO mode.
     
    Heavyd, Mar 25, 2013
    Heavyd, Mar 25, 2013
    #4
  7. Mar 25, 2013 #5
    Rudy5

    Rudy5 Light Load Member

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    Mar 17, 2013
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    So would you say it was normal for that part to leak? I mean, could it be made to release a certain amount if air when the trailer brakes are released? The air is coming from the end of that black, plastic piece. The hissing comes from there, drives me crazy
     
    Rudy5, Mar 25, 2013
    Rudy5, Mar 25, 2013
    #5
  8. Mar 26, 2013 #6
    Hammer166

    Hammer166 Crusty Information Officer

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    It's not supposed to leak, change it out.
     
    Hammer166, Mar 26, 2013
    Hammer166, Mar 26, 2013
    #6
  9. Mar 26, 2013 #7
    Heavyd

    Heavyd Road Train Member

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    Nope, failed part, change it.
     
    Heavyd, Mar 26, 2013
    Heavyd, Mar 26, 2013
    #7
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