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Bench Bleeding Question

Discussion in 'The Hokey Ass Message Board' started by BadgeZ28, Sep 19, 2012.

  1. BadgeZ28
    Joined: Oct 28, 2009
    Posts: 1,099

    BadgeZ28
    Member
    from Oregon

    I am trying to get all the air out of a dual master cylinder. It is a used unit that came with a project car. Mid 80's S10 master cylinder. Did a search and didn't find what I need. I am using hoses returning fluid to the reservoirs. I have one that instantly started pumping air out of the bottom orifice. Got all the air out of it, but the other one is only pumping fluid out of the return hose, not the bottom orifice. I am pressing the cylinder in about a inch with each stroke. Should I be seeing air and then fluid coming up out of both orifices? Thanks
     
  2. V8 Bob
    Joined: Feb 6, 2007
    Posts: 2,752

    V8 Bob
    ALLIANCE MEMBER


    Why don't you full stroke it and see what happens. :confused:
     
  3. brad chevy
    Joined: Nov 22, 2009
    Posts: 2,627

    brad chevy
    Member

    As V8 Bob said full stroke will get it all out.
     
  4. BadgeZ28
    Joined: Oct 28, 2009
    Posts: 1,099

    BadgeZ28
    Member
    from Oregon

    I have the master cylinder setup in a vice. I am pressing the back with a rod. I am only getting about a inch travel. Is that the problem?
     

  5. BadgeZ28
    Joined: Oct 28, 2009
    Posts: 1,099

    BadgeZ28
    Member
    from Oregon

    I am actually getting about a 1 5/8 stroke. It feels bottomed out at that point. Still only getting fluid coming through the hose to the reservoir on one. Nothing coming up from the bottom. This is a used piece and I am wondering it it is bad?
     
  6. propwash
    Joined: Jul 25, 2005
    Posts: 3,858

    propwash
    Member
    from Las Vegas

    I would NEVER install a used brake cylinder - master or wheel - without a complete rebuild. That fluid is hygroscopic (attracts/absorbs water/moisture readily). This will allow it to permeate a brake system and collect/settle in cylinder bores, corroding the walls. That corrosion will tear the rubber seals.

    Take it apart, install a complete rebuild kit (hone if necessary), then do your bench bleeding.

    dj
     
  7. Dog Dish Deluxe
    Joined: Dec 23, 2011
    Posts: 778

    Dog Dish Deluxe
    BANNED
    from MO.

    I prefer pressure bleeding. get a spare master cyl cap and drill it out and weld an air fitting to it and hook up a pressure regulator from a paint gun and an air hose and run it at about 10 psi and you can bleed your whole system in seconds with no pedal pumpin "hold it, pump it, hold it" B.S.
     
  8. BadgeZ28
    Joined: Oct 28, 2009
    Posts: 1,099

    BadgeZ28
    Member
    from Oregon

    Gave up. Just picked up a rebuilt.
     

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