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Would I gain anything going to a 77 style 3/4-ton master cylinder & booster

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by IGOR, Feb 15, 2003.

  1. IGOR

    IGOR 1/2 ton status Premium Member

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    I know I've seen similar questions to this answered before,
    but would like an idiot-proof answer.

    On the First Gen, the prop valve is right next to the master cylinder.

    Is there an additional prop valve somewhere else on our trucks? (I'm too lazy to look - and this site is such a wealth of information)

    Do the newer style trucks have the same style prop valve as ours?

    In my opinion this valve this close to the master cylinder is a little unsightly - would it be possible to move it.

    I know Greg72 went to 1-ton running gear with no problems after replacing a vac hose.

    Would I gain anything by getting a '77 3/4-ton style master cylinder & booster when I go to 3/4-ton axles with front & rear discs. (corp 10 bolt & 14 bolt)
     
  2. R72K5

    R72K5 Banned

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    no, just one combo valve per truck, they all do the same thing and are same design as far as what they do and how they operate

    i cant see much gain by putting 3/4 ton booster and cylinder on unless youre really hauling alot of weight all the time,
     
  3. Triaged

    Triaged 1/2 ton status

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    2nd gen blazers use a prop valve mounted on the frame rail. It is also used as a "T" in the line (it has 2 front outputs).
     
  4. Steve_Chin

    Steve_Chin 1/2 ton status

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    FWIW, you can plug one of the front outlets on a dual front outlet proportioning or combination valve by installing a bleeder screw in it like I did for my 4 wheel disc setup.
     
  5. IGOR

    IGOR 1/2 ton status Premium Member

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    Steve-

    Forgive my ignorance, but what would you benefit by doing that?
     
  6. Steve_Chin

    Steve_Chin 1/2 ton status

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    Simple, it allows me to run the proportioning valve that I needed to run with the 4-wheel disc setup. The stock combination valve certainly wouldn't have worked properly.
     

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