What brake booster master cylinder do I need duster

Discussion in 'Brakes for your Classic Mopar' started by Steve Agrella, May 14, 2018.

  1. Steve Agrella

    Steve Agrella Well-Known Member

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    just picked up a 74 Duster with front disc, drum rear manual brakes can anyone suggest a power brake master cylinder setup for me please
     
    Last edited: May 14, 2018
  2. tonysrt

    tonysrt Well-Known Member

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    Were Dusters made in 77? Thought the f bodies replaced them in 77, Aspen and Volare.
     
  3. Steve Agrella

    Steve Agrella Well-Known Member

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    74 Duster
     
  4. Steve Agrella

    Steve Agrella Well-Known Member

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    I was told by a local mechanic I need a proportional valve also ??
     
  5. 6pk2goDemon

    6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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    If your car has disc brakes, there should already be a proportioning valve in place.
     
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    • Steve Agrella

      Steve Agrella Well-Known Member

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      Thanks
       
    • Steve Agrella

      Steve Agrella Well-Known Member

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      Where is the proportioning valve located, if I put a brake booster and new master cylinder in that’s all I need to do to make it work

      it work
       
    • tonysrt

      tonysrt Well-Known Member

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      On my 74 Duster it's on the drivers side on the frame rail about a foot below Master cylinder. It has the brake lines attached to it. Follow them down from M/C and you should see the block aka proportional valve.
       
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      • TF360

        TF360 Well-Known Member

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        You can get the master cylinder and booster from a parts store- they still have them, or a least they did a couple years ago.
         
      • Mattax

        Mattax Just the facts, ma'am FABO Gold Member

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        A '74 proportioning valve is included in the '70 and up distribution block with switch and proportioning valve.
        I beleive the combo valve is the same as used in the earlier years as the pressures it proportiona re about the same.
        Visualy it looks like the one in the upper left corner.
        1972 Imperial & Chrysler Disc Brake Service Repair Book from the Master Technician's Service Conference (Session 293)

        Master Cylinders will look similar to this:
        1973 Chrysler and Imperial Brake Reconditioning Repair Guide from the Master Technician's Service Conference Session 309

        '73 used a different master cylinder for power and manual disk setups.
        FWIW here's my work in progress crib sheet for Original A-body Master Cylinders & Bore. Feel free to add, question or correct (especially if you have a documented source).

        years___Application_____________p/n_______Bore
        1966... Fixed Ft calipers, Manual................1"
        1966... Fixed Ft calipers, Power..................1"
        67-70.. Fixed Ft calipers...........2808600.....1"
        71-72.. Fixed Ft calipers...........3461178.....1 1/32
        73-74.. Floating caliper, Manual..3580146.....1 1/32
        73-74.. Floating caliper, Power.. 3580112........15/16

        1976?...............................____4647..........15/16
         
        Last edited: May 17, 2018
      • BillGrissom

        BillGrissom Well-Known Member

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        You need more that a booster and MC. You need the brackets which stand-off from the firewall and have a lever. You won't find those at an auto parts. I have seen a complete new setup (brackets, booster, MC) on ebay for ~$170 (a great deal). The booster appears based on a GM one (threaded rod), but they give you all the parts to connect to your Mopar pedal.