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Proportioning valve questions

Discussion in 'Fox Body Mustangs' started by kezell, Jun 20, 2018.

  1. kezell

    kezell MW3-kezell17 Established Member

    Mar 5, 2004
    St.Amant, LA
    I am working on a 93 Cobra. The proportioning valve is missing the rubber plug at the forward end. I do not want to have to gut the PV and convert over to manual.

    I was able to find a rebuild kit for the internals but this kit does not come with a new plug for the end cap.

    What are the options here. I have a few spare PV laying around but sadly they all seem to have the same plug missing or damaged.

    What is the function of this plug? Is it a tattle-tale for the seal going bad internally?
  2. John Grabowicz

    John Grabowicz New Member

    May 25, 2018
    Littlerock, CA
    You can buy a replacement end plug that does not have the rubber plug from LMR. I'm not sure what the use of the rubber is- maybe some sort of blow off in case of some massive brake pressure?
    Otherwise if you want a rubber, i think the only place you could find one is the junkyard. Maybe a dealer part?

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