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    Author Topic: 1971 cuda Proportioning Valve  (Read 4866 times)

    Offline wantone

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    1971 cuda Proportioning Valve
    « on: September 11, 2015 - 04:30:58 PM »
    Howdy-

    Which is correct in a P/B  Front Disc and Rear Drum setup?
    http://www.classicindustries.com/product/mopar/parts/md2271.html
    or
    http://www.classicindustries.com/product/mopar/parts/mp500503.html

    thanks!   

    My current one looks like the first MD2271 but has a female receptor for the dash light.
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    Offline anlauto

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    Re: 1971 cuda Proportioning Valve
    « Reply #1 on: September 11, 2015 - 04:37:55 PM »
    Second one #500503
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    Offline wantone

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    Re: 1971 cuda Proportioning Valve
    « Reply #2 on: September 11, 2015 - 04:46:26 PM »
    Any pictures of installation by chance?????

    Sorry to nag - just not what I have in there now ... which may explain why the car stops like ca-ca.  :working: :banghead:
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    Offline roadman5312

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    Re: 1971 cuda Proportioning Valve
    « Reply #3 on: September 11, 2015 - 04:46:43 PM »
    Anybody know what that metering valve does on the second one, ?????    :rebel:
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    Offline anlauto

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    Re: 1971 cuda Proportioning Valve
    « Reply #4 on: September 11, 2015 - 06:11:42 PM »
    Maybe your car was an original drum brake car that someone added front disc to :dunno:
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    Offline wantone

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    Re: 1971 cuda Proportioning Valve
    « Reply #5 on: September 14, 2015 - 12:00:53 PM »
    Great photo!  Thank you...

    Follow-up > what is the fitting called that slides over the brake line at the ends?   They're 3/8-24 & 7/16-24 but I can't figure out what they're called.

    Finally - what size tubing are you using????
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    Offline anlauto

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    Re: 1971 cuda Proportioning Valve
    « Reply #6 on: September 14, 2015 - 12:09:29 PM »
    Your best bet is to buy pre-bent lines from Fine Lines Inc....they don't cost that much and they're an exact fit. :2cents:
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    Offline jhaag

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    Re: 1971 cuda Proportioning Valve
    « Reply #7 on: September 14, 2015 - 09:49:17 PM »
    called tube nuts. brake line size is 3/16
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    Offline wantone

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    Re: 1971 cuda Proportioning Valve
    « Reply #8 on: September 15, 2015 - 12:03:10 PM »
    have i mentioned that i love this site?   

    Does anybody use thread sealer when putting these together or just hook-up and go?
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    Offline roadman5312

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    Re: 1971 cuda Proportioning Valve
    « Reply #9 on: September 15, 2015 - 03:56:14 PM »
    Quote from: wantone on September 15, 2015 - 12:03:10 PM
    have i mentioned that i love this site?   

    Does anybody use thread sealer when putting these together or just hook-up and go?
                           Never use thread sealer on brake or fuel lines.   :nono:
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    Offline wantone

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    Re: 1971 cuda Proportioning Valve
    « Reply #10 on: September 20, 2015 - 11:28:01 PM »
    Crap... Bleeding my valve resulted in fluid loss from the large reservoir when bleeding the rear and small when doing the front.   

    I used a mbm replacement proportioning valve and metering valve.  I followed the setup via the online instructions and am at a loss for what I did wrong.
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    Offline anlauto

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    Re: 1971 cuda Proportioning Valve
    « Reply #11 on: September 21, 2015 - 06:37:21 AM »
    The large portion of the master cylinder is for the front disc brakes. Is it possible you got the two lines at the master mixed up ? Did you make your own lines ?
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    Offline wantone

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    Re: 1971 cuda Proportioning Valve
    « Reply #12 on: September 21, 2015 - 11:50:51 AM »
    I can't imagine that I had it switched backwards.   I made my own lines and have since decided that I made a mistake as one of them leaks.   I've just bought the jumper and two MC lines from SSTUBES/Fine Lines today.   

    I cannot imagine that the MBM link showed the wrong hook-up.   Do you have any pics that show the routing from the MC to your PV/MV?   I lose viability from your shot above.
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    Offline EB3-GranCoupe

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    Re: 1971 cuda Proportioning Valve
    « Reply #13 on: September 21, 2015 - 09:28:52 PM »
    Quote
    Anybody know what that metering valve does on the second one?


    yes, it delays, ever so slightly, the the front discs from engaging.  It allows for the back drums to grab hold a wee bit before the discs.

    This is a great tech article from 1967:
    http://www.imperialclub.com/Repair/Lit/Master/233/page06.htm

    Having the Metering Valve, keeps the front end from locking up first, and the rear from fishtailing around.
    « Last Edit: September 21, 2015 - 09:32:15 PM by EB3-GranCoupe »
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    Offline wantone

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    Re: 1971 cuda Proportioning Valve
    « Reply #14 on: September 23, 2015 - 10:40:27 AM »
    file:///C:/Users/rclinkenbeard/Downloads/PV6070MOP%20(2).pdf

    ^^ The above valve is what i'm using to determine routing... The problem I see is that the valve to the rear ( LARGE MASTER CYLINDER SIDE ) goes to the REAR brakes.   WHAT THE HECK

    https://www.sstubes.com/ekt7008
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