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Bench Test a Master Cylinder

Discussion in 'Early CJ5 and CJ6 Tech' started by navy67, Sep 23, 2006.

  1. Sep 23, 2006
    navy67

    navy67 It's a Jeep thing!

    San Diego
    Joined:
    Aug 1, 2005
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    87
    I have a 67 CJ5 with drums all around, the single MC. I have removed it, ordered the rebuild kit. I am now ready to install, how do I bench test it?

    :v6: :flag:
     
    navy67, Sep 23, 2006
    #1
  2. Sep 23, 2006
    CD60

    CD60 Member

    Northern California
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    Sep 13, 2006
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    222
    Do you mean bench bleed?
     
    CD60, Sep 23, 2006
    #2
  3. Sep 23, 2006
    navy67

    navy67 It's a Jeep thing!

    San Diego
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    yes
     
    navy67, Sep 23, 2006
    #3
  4. Sep 23, 2006
    CD60

    CD60 Member

    Northern California
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    Sep 13, 2006
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    Hopefully it came with fittings that will screw into the holes on the side. Put it into a vise. Screw the fittings into the holes. Attach some vacuum hose to the fittings and put the hose into the resevoirs. Fill the resevoirs with brake fluid. Using a screwdriver pump the master cylinder. This will cycle the fluid threw. When you don's see any more air bubbles you are done. Hope that makes sense.
     
    CD60, Sep 23, 2006
    #4
  5. Sep 23, 2006
    navy67

    navy67 It's a Jeep thing!

    San Diego
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    Aug 1, 2005
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    I have the single res MC, will this still work?
     
    navy67, Sep 23, 2006
    #5
  6. Sep 24, 2006
    CD60

    CD60 Member

    Northern California
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    Yes. You just need a line going from the fitting on the side into the resevoir. Fill with fluid and pump until there are no air bubbles.
     
    CD60, Sep 24, 2006
    #6
  7. Sep 24, 2006
    Rondog

    Rondog just hangin' out

    Parker, CO
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    Aug 25, 2005
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    On a single res. cylinder, your fitting is probably on the end, not on the side.
     
    Rondog, Sep 24, 2006
    #7
  8. Sep 24, 2006
    CD60

    CD60 Member

    Northern California
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    Oops yeah that's right.:) The procedure will be still be the same though.
     
    CD60, Sep 24, 2006
    #8
  9. Sep 24, 2006
    tommy b

    tommy b Member

    Golden, Colorado
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    Oct 23, 2005
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    Probably overkill, but I like to use clear vinyl tubing, available at your FLHS, just to see there are no bubbles inside the hose. The black vacuum hose works fine, though.

    tommy b
     
    tommy b, Sep 24, 2006
    #9
  10. Sep 24, 2006
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Nov 6, 2002
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    4,275
    Since I already had the stoplight switch out and the lines disconnected from the "Y" fitting, I just put it all back together outside of the Jeep and used a piece of 3/16" brake line to put both ports back up into the fluid reservoir. I just bought a 2-foot piece of pre-flared brake line at the FLAPS and cut it in half. Bend the ends up and around so that they are submerged under the fluid and gently depress the piston with a long phillips screwdriver until all the bubbles disappear.

    Oh, and make sure you replace the copper washers/seals on the "Y" block when you reassemble it for good. They're supposed to be a one-time use deal. ;)
     
    w3srl, Sep 24, 2006
    #10
  11. Sep 24, 2006
    mruta

    mruta I drank with Billy!

    Downers Grove, IL
    Joined:
    Sep 22, 2002
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    422
    Be careful here. A long screwdriver will work though a better idea is to use a wooden dowel rod or cut off broom stick handle. A screwdriver can scratch the bore of the master cylinder if you're not careful, causing it to leak. Please don't ask me how I know. :oops:
     
    mruta, Sep 24, 2006
    #11
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