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A forum for the owners and enthusiasts of General Motors B-Bodies from 1977-1990, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


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    Proportioning Valve

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    Jakers01
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    Post  Jakers01 Sun Aug 02, 2015 8:54 pm

    I am just finishing converting my 2 door 78 caprice to a 94 9c1 rear end with disk brakes. Also installed 94 front spindles to accomidate 12" rotors and 5x5 bolt pattern. I have installed 94 brake booster, master cylinder and proportioning valve. I have installed stealth bolt mod kit. My question is... how do I deal with the old proportioning valve that's mounted to the frame. Can I gut it exept for the pin that separates front and rear circuits? Any help would be appreciated.

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    Sweet Seventy9
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    Post  Sweet Seventy9 Sun Aug 02, 2015 9:32 pm

    The old one is no longer used. Remove it and throw it out. Install new fluid lines. Viola', all set!

    * Don't forget - The newer master cylinder and Combo valve use metric fittings and BUBBLE flares on the lines.
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    Jakers01
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    Post  Jakers01 Tue Aug 04, 2015 8:15 pm

    Jeez.... I was afraid of that. Was thinking I could take old valve, drill and tap the thru hole for a 1/16 pipe plug on both sides. then it would be just a manifold with separate circuits.
    I will have to redo tubing from new valve to old valve.
    Thx
    HeavyChevy77
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    Post  HeavyChevy77 Wed Aug 05, 2015 1:14 am

    You should have used a 90 caprice master cylinder and booster only need two adapter fittings and an eBay combo valve (chrome $50 opens up the rear brakes I've tested/ask my four 10ft long skid on the road when someone cut me off)
    FYI primaries and secondarily swap locations on the master cylinder so just gently pull and bend /manipulate them to cross easy other and putting the fittings adapters (9/16x18 to 1/2"x20 &Vic versa)) and done. The combo valve is plus and play so is the booster.
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    Z77impala
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    Post  Z77impala Mon Jan 16, 2017 5:00 pm

    I did the exact swap you did, and I just had to remove the old proportion valve down on the drivers side frame, and connected the rest of the lines together

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