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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » proportioning valve

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    5/18/2023 1:36 PM  #1

    bulletbirdman
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    From: Saucier, Mississippi
    Registered: 5/23/2013
    Posts: 480

    proportioning valve

    If your swaping a single master cylinder for a dual with front and rear drums, do you need a proptioning valve?

    I made enough money to buy Miami, but pissed it away so fast
     

    5/18/2023 2:18 PM  #2

    RTM
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    From: Cape Coral FL
    Registered: 5/22/2019
    Posts: 1,059

    Re: proportioning valve

    I think the prop valve should match your braking system which in your case it still does.  I would think you should be fine.

     

    5/18/2023 5:42 PM  #3

    50vert
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    From: QLD Australia
    Registered: 4/01/2013
    Posts: 1,358

    Re: proportioning valve

    No prop valve on a factory drum/drum setup.
    Use a m/c with r/p valves front and rear.

    "Those telephone poles were like a picket fence"
     

    5/19/2023 11:43 AM  #4

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,733

    Re: proportioning valve

    No proportioning valve needed on cars with all drum brakes.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    5/19/2023 7:17 PM  #5

    Bullet Bob
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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,780

    Re: proportioning valve

    Also, some four wheel disc systems may not require a porp. valve.  I have 12.5 GT discs on the front and 11.25 Explorer discs on the rear.  After a lot of messing around I found that no porp. valve works perfect.  I'm assuming that due to the difference in disc diameter and pad swept area the leverage is about perfect for front to rear braking percentages.  It will not lock the rears and the fronts will put you through windshield.  I had to do a semi-panic stop coming home from the Bash last year and couldn't have been happier with braking performance.

    Last edited by Bullet Bob (5/19/2023 7:19 PM)

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    5/19/2023 9:25 PM  #6

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,785

    Re: proportioning valve

    I needed a adjustable pro po valve to dial in my MKIII rear / stock front disk.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

     

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