My '73 Pro Street Project

Discussion in 'Project Progress' started by Jodi, May 24, 2019.

  1. Jodi

    Jodi Member

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    Master cylinder from a late '70's corvette will be use for hood clearance. Here's a side by side height comparison.
    master cylinder.jpg 20191025_090212[26342].jpg
     
  2. Jodi

    Jodi Member

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    Remove the bracket from the factory vacuum booster and cut the pushrod end and set it aside for now.
    20191005_203405[25166].jpg booster pushrod cut.jpg
     
  3. Jodi

    Jodi Member

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    After trial fitting the unit to the car, I found that the factory booster bracket angle is too steep which made the hydroboost pushrod angle too much when hooked up to the brake pedal. Ended up making a bracket with less angle.
    bracket angle comparison.jpg bracket welded.jpg bracket before weld.jpg
     
  4. Jodi

    Jodi Member

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    The hydroboost pushrod is too short and the tip hole is too big for the application. The factory vacuum booster pushrod tip must be use.
    Cut the hydroboost pushrod tip off and discard...thread the remaining part of the pushrod . Also thread the factory vacuum booster pushrod tip that was cut before. Combine the two with a coupling nut, adjust to the proper length and weld.

    20191023_175146[26266].jpg push rod and coupling nut.jpg pushrod and coupling nut assembly.jpg
     
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  5. Jodi

    Jodi Member

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    I had to make new brake lines because the old one would not lined up anymore. The proportioning valve was relocated under the master cylinder, old location was under the vacuum booster.
    20191023_202824[26268].jpg 20191022_150038[26206].jpg
     
  6. Jodi

    Jodi Member

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    I finally got all the fittings! so now I could finish the plumbing on the hydroboost conversion. 20191031_111923[26604].jpg 20191031_111932[26603].jpg 20191031_111953[26606].jpg
     
  7. Jodi

    Jodi Member

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    Decided to use an oil cooler on the conversion (why not), I have this cooler lying around in the garage... don't even remember what it came out off. I cut the end of the inlet/outlet tubing shorter to make it fit better and added a hose retaining bump on the tip using a flaring tool. Also added an extension on the left side bracket for mounting on the radiator cradle. 20191101_095823[26656].jpg 20191031_143718[26607].jpg
     
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  8. Jodi

    Jodi Member

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    Here's a numbered diagram of the line connections and where they connect to. Maybe someone doing the same modification or thinking about doing the modification will find it helpful. The Hydroboost unit basically hooks up in series between the power steering pumps pressure line.
    #7 - Hydroboost inlet connects to the pressure outlet of the power steering pump (18mm x 1.5 to -6 AN fitting is required on the hydroboost and a 90 degree 5/8 inverted flare x -6 AN fitting on the Power steering pump. #1 - Hydroboost outlet connects to the pressure outlet of the gear box (16mm x 1.5 to -6 AN fitting is required on the hydroboost and 11/16 inverted flare to -6 AN fitting on the gear box. #3 - Hydro boost return line connects to the tee fitting #2 - Gear box return line connects to the oil cooler inlet. #6 - Return line connects to the oil cooler outlet #5 - Return line from tee fitting to the fluid reservoir. HAPPY WRENCHING!!! . 20191108_151859[27517]_LI.jpg 20191108_152058[27518]_LI.jpg
     

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