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Another brake line question

Discussion in 'Early CJ5 and CJ6 Tech' started by FireFighter0817, Nov 26, 2013.

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  1. Nov 27, 2013
    djbutler

    djbutler Sponsor

    Rio Linda CA
    Joined:
    Nov 5, 2007
    Messages:
    727
    My '70 has that same brass block that as far as I can tell is nothing but a distribution Tee. There are no internal switch components or proportioning valve components that I can discern.
    What I found really interesting was the manner in which the 68-71 systems using the Lockheed-Wagner dual reservoir MC achieved a differential pressure in the front/rear brake systems. The MC uses a stepped bore, with the smaller bore feeding the front system and the larger bore feeding the rear.
    A little reflection on Pascals law will show you that the smaller bore produces a higher hydraulic pressure for the front system than the rear, thus balancing the braking effort properly to prevent rear lock-up.

    Folks who have replaced these MC with aftermarket MC using a straight 1" bore will lose this engineered pressure differential. Making a swap like this may call for installation of an in-line proportioning valve.

    Don
     
    djbutler, Nov 27, 2013
    #21
  2. Nov 28, 2013
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
    Messages:
    4,422
    Sure that's not the other way around?
    With a smaler bore on the mc your pushing less fluid compared to the larger bore moving the same distance. ??
     
    termin8ed, Nov 28, 2013
    #22
  3. Nov 28, 2013
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    Smaller bore in the m/c gives more pressure but less volume all other things being equal. Kind of an inverse proportion.


    Sent from my iPhone
     
    nickmil, Nov 28, 2013
    #23
  4. Nov 28, 2013
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    9,835

    Following the Universal Law, "There ain't no free lunch."
     
    PeteL, Nov 28, 2013
    #24
  5. Nov 30, 2013
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
    Messages:
    4,422
    In my best tim allen voice...
    Oh yea...

    Shoulda thought that one over more:rofl:
     
    termin8ed, Nov 30, 2013
    #25
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