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Do I need a proportioning/combination valve on my 1960 CJ5?

Discussion in 'Early CJ5 and CJ6 Tech' started by Tater76, Nov 12, 2014.

  1. Nov 12, 2014
    Tater76

    Tater76 New Member

    Southwest Idaho
    Joined:
    Oct 31, 2014
    Messages:
    27
    Just like the title says, is it necessary to install a proportioning valve in my system? I have upgraded to the dual master cylinder, new lines, 11" brake upgrade. If I need one does anyone have a part number and supplier?

    Also, the pressure switch...... is it's job to activate the brake lights? or backup lights? Does it need to be mounted on the proportioning valve? or 4 way tee? Sorry if that's a stupid question, I'm a brake noob.

    Any help is very much appreciated, as I need to finish the brakes so I can install the new drivetrain :D
     
  2. Nov 12, 2014
    supertrooper

    supertrooper Member

    moreno valley, ca
    Joined:
    Nov 12, 2007
    Messages:
    770
    The pressure switch is for the brake lights. The back up switch should be mounted to the shift tower on the transmission. You can get a universal proportioning valve and add it inline with the rear brake line.
     
  3. Nov 12, 2014
    Tater76

    Tater76 New Member

    Southwest Idaho
    Joined:
    Oct 31, 2014
    Messages:
    27
    Awesome! Thanks for the info, but what about the valves that regulate the front and back? I think they are called combination valves? Are they necessary? Or can I get away with just regulating the back lines?
     
  4. Nov 12, 2014
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
    Messages:
    8,149
    It depends on which wheel cylinders you used, if the same diameter front & back then yes you need a proportioning valve. if you used a smaller diameter cylinder in the back then you shouldn't need the valve. IIRC without the valves fronts should be 1" & rears 15/16ths or 7/8 th's diameter.

    H.
     
  5. Nov 14, 2014
    jeep2003

    jeep2003 Well-Known Member

    Upstate NY
    Joined:
    May 30, 2006
    Messages:
    1,948
    you can put the pressure switch anywhere you want. mine is in the rear line and it works fine. I would build it without a proportioning valve. if you really feel the back brakes pulling and locking up before the front then install it. but i have never had an issue when removing them
     
  6. Nov 15, 2014
    Tater76

    Tater76 New Member

    Southwest Idaho
    Joined:
    Oct 31, 2014
    Messages:
    27
    Thanks for the reply. I think I will try it without because I am having a heck of a time finding a universal one. All I have to go off of is grainy pics found off of the internet. Most of them have the four ports for front and back lines. Nobody seems to have a part number or definite idea around my neck of the woods. I am starting from scratch, so I just want to do it right once. I will try to post pics of everything so maybe it will help somebody else in the future.
     
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