1. Damien B.

    Damien B. Well-Known Member

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    Hi everyone
    In the near futur i will be replacing my rear drum brake for disc braker, i already have front disc braker.
    My question is will i need to replace the current proportionning valve ?
     
  2. pnora

    pnora FBBO Gold Member FBBO Gold Member

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    On my 69 Charger I did not. You will have to get a master cylinder. I got all my stuff from Cass. Dr. Differential.
     
  3. Damien B.

    Damien B. Well-Known Member

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    Do you mean i ll have to change my master cylinder ? I have a braker booster and a master cylinder with 2 circuit
     
  4. Damien B.

    Damien B. Well-Known Member

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    B-bump
     
  5. Redsawacs

    Redsawacs Active Member

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    The way I understand things, if your drum brake master cylinder has a residual valve in it, you will have to remove it or buy a master cylinder that has it removed already.

    February 2022 issue of Mopar action magazine talks about removing them.
     
  6. 1STMP

    1STMP FBBO Gold Member FBBO Gold Member

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    Is your brake system manual, or boosted?
    You won't need to change your proportion
    Valve, but will have to set up the new system
    on either one of those two criteria. 4 wheel
    disc will require a master cylinder with a larger
    bore diameter. (usually 1.032-1.125), and
    running a 2lb residual check valve to the
    rear if you run the newer style disc system.
    (the pistons retract farther on the newer stuff).
    Also, since you'll be introducing air into the
    system, when bleeding the front calipers,
    the bleeders have to be rotated to the highest
    point.
    I just went thru all this, but everything on my
    brake system is new, using Ford rotors, twin
    piston calipers on the front, and Ford Explorer
    single piston calipers on the rear.
    Note the residual check valves and
    proportioning valves in the bottom pic.
    20180423_164922.jpg 20190108_101210.jpg20211227_151541_HDR.jpg
     
  7. Damien B.

    Damien B. Well-Known Member

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    Thanks for the replies here is what I currently have on my car.
    Front brakes are wilwood disc brake and the rear are regular drums

    IMG-20220112-WA0003.jpg IMG-20220112-WA0005.jpg IMG-20220112-WA0007.jpg
     
  8. pnora

    pnora FBBO Gold Member FBBO Gold Member

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    I see two things. 1-Are those copper lines???? 2-Proportioning valve switch is damaged.
     
  9. RemCharger

    RemCharger Well-Known Member

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    What kind of car are we looking at here?
     
  10. 1STMP

    1STMP FBBO Gold Member FBBO Gold Member

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    I agree with pnora....
    The proportioning valve you have is damaged.
    If the lines you're using are regular copper and
    not nickle copper, you are running the risk
    of bursting a line or splitting at the fittings.
    Especially during a panic stop.
    It would be helpful to know (as RemCharger
    brought up) what car this system is on.
     
    Last edited: Jan 13, 2022
  11. Damien B.

    Damien B. Well-Known Member

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    how can you tell the switch is damaged what made you notice it
    I m guessing copper but since i m not the one that installed that brake system i cant be sure

    1971 plymouth satellite that had many owner so this is why i m trying to figure out what is needed to change/repair
     
  12. RemCharger

    RemCharger Well-Known Member

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    Yikes, that's pretty mad max. Not much chrysler left there.
     
  13. pnora

    pnora FBBO Gold Member FBBO Gold Member

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    Just look on line and you will see what yours is missing.
     
  14. 1STMP

    1STMP FBBO Gold Member FBBO Gold Member

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    If it were my car, I would replace everything
    except for the booster and the front disc
    brakes. New Master Cylinder, proportioning
    valve, lines, and hoses. You're running on
    borrowed time with the copper stuff. Just
    my opinion, of course.
     
    • Agree Agree x 1
    • Damien B.

      Damien B. Well-Known Member

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      feel free to point it out to me as if i m toddler, i m a neophyte.
      maybe it s the photo angle there is 4 line coming out of it and one coming from the top

      will do
       
    • pnora

      pnora FBBO Gold Member FBBO Gold Member

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      Compare your to this.

      pv.jpg
       
    • Damien B.

      Damien B. Well-Known Member

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      Okay I see, the one on my car is a different model most definitely not the proper one.
      I thought you meant a piece on it was broken.
       
    • pnora

      pnora FBBO Gold Member FBBO Gold Member

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      It is look at the switch on the valve.
       
    • Redsawacs

      Redsawacs Active Member

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      I don't see anything wrong with that switch. the plastic blends in with the firewall and looks like it is missing, but thats all I see.....should have a wire attached to it though.

      https://www.doctordiff.com/1-piece-proportioning-valve.html
      https://www.doctordiff.com/70-71-e-body-2-piece-proportioning-metering-valve.html

      Start here, there is a nice fancy diagram that may help get you started. These aren't for your car specifically, but you will get the idea.

      Then go here and watch the video from Inline tube - again, a starting point.

      https://www.inlinetube.com/pages/tech-support

      I am in the process of working out new brakes for my 65 Coronet Convertible now, it has been a WONDERFUL eye-opening experience!
       
      • Thanks! Thanks! x 1
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