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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Single vs dual diaphragm booster

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    9/16/2014 1:24 PM  #1

    Rsmach1
    FYI FORD Member

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    From: Downey, CA.
    Registered: 4/05/2014
    Posts: 80

    Single vs dual diaphragm booster

    Hello all, I'm putting together a parts list for my 69 auto m code mach1. Originally it came with a bendix (dual diaphragm I think) booster. Are there any pro's or con's to switching over to a 9" single diaphragm? Wich will work better with lower vacuum or does  it make any difference? Thanks.

    Last edited by Rsmach1 (9/16/2014 1:27 PM)

     

    9/16/2014 4:13 PM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,688

    Re: Single vs dual diaphragm booster

    The DD Bendix original booster is the best for that car.  If I was going to change anything, I would get the same booster and pedal except from a 70 Mustang.  The pedal has a better ratio than the 67-69.

    I would NEVER consider putting a Chinese 9" booster as a replacement for an original dual diaphragm Bendix.

    BTW, I just tried to buy some more 69 Bendix boosters and as far as I can tell, I am the only one in the USA that has any.  And supply is getting VERY short.  Luckily there are rebuilders that can make your old one good as new.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    9/16/2014 7:22 PM  #3

    ultrastang
    I FYI 24-7

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    From: Camden, Arkansas
    Registered: 4/01/2013
    Posts: 570

    Re: Single vs dual diaphragm booster

    What Steve said.

    You need at least 18"-20" of vacuum for any vacuum brake booster. If your engine will not produce this, no vacuum booster is going to work at its optimum potential. If your engine will not produce this, your choices are to go to manual brakes (I wouldn't do that), get a stand - alone vacuum pump to operate the booster with or, go to hydroboost. --hydroboost requires more components to install but, it also gives you the most amount of room between the unit and the engine.

    Last edited by ultrastang (9/16/2014 7:23 PM)

     

    9/16/2014 8:46 PM  #4

    Rsmach1
    FYI FORD Member

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    From: Downey, CA.
    Registered: 4/05/2014
    Posts: 80

    Re: Single vs dual diaphragm booster

    Thanks for the replys, anyone here done a hydraboost swap? Curious what yr, make, and model car would be a good donor for doing this. Thanks again.

       •Thread Starter
     

    9/16/2014 10:00 PM  #5

    barnett468
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    Registered: 9/15/2014
    Posts: 770

    Re: Single vs dual diaphragm booster

    Rsmach1 wrote:

    Thanks for the replys, anyone here done a hydraboost swap? Curious what yr, make, and model car would be a good donor for doing this. Thanks again.

    that is way more complicated then simply adding a vacuum pump.
    .
     

     

     

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