84 QV Cab brakes- Anyone installed vacuum reservoir or vacuum pump/both? | FerrariChat

84 QV Cab brakes- Anyone installed vacuum reservoir or vacuum pump/both?

Discussion in 'Mondial' started by stasha, Sep 15, 2021.

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  1. stasha

    stasha Karting

    Sep 10, 2021
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    steve steve
    #1 stasha, Sep 15, 2021
    So, I had the engine quit suddenly while at highway speeds, and immediately lost power brakes. Pedal pressure required to manuever the car was a bit alarming. I'm not sure that my wife would have been able to press the brake pedal hard enough to stop the car quickly and safely enough.

    Brakes tend not to be high on the priority list until you suddenly need them, and need them quickly (my focus tends to be on just getting the hundreds of nitpick items working on the car, including the fuse panel problems, AC, windows, switches, cooling system, on and on).

    Has anyone tried installing a vacuum reservoir and/or electric vacuum pump in the braking system to at least retain some power assist after the engine quits?

    When I converted by 66 Mustang to power brakes, I install an electric vacuum pump and reservoir because of the competition cam not allowing adequate vacuum to the booster -- and it worked instantaneously.

    Any comments/suggestions?
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    #2 Steve Magnusson, Sep 15, 2021
    This should not happen. There is a check valve, item 30 here:

    https://www.ferrariparts.co.uk/Diagram/Ferrari/Mondial-QV-Coupe-Cabriolet/028-Brake-Hydraulic-System

    that should "trap" enough vacuum inside the booster and line to work for a short while after the engine stops. You either have a bad check valve or a leak in the booster/line. The check valve is in the engine bay near the LH side of the intake plenum -- you should be able to blow thru it in one direction (towards the engine in the direction of the arrow) and not be able to blow thru it in the other direction (towards the booster).
     
    afterburner and stasha like this.
  3. stasha

    stasha Karting

    Sep 10, 2021
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    steve steve
    #3 stasha, Sep 15, 2021
    Thank you!
    I will add it to the ever-growing to-do list.
     
  4. afterburner

    afterburner F1 Rookie
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    #4 afterburner, Sep 17, 2021
    stasha likes this.
  5. moysiuan

    moysiuan F1 Rookie
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    #5 moysiuan, Sep 17, 2021
    Is there something like this on the 3.2?
     
  6. afterburner

    afterburner F1 Rookie
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    #6 afterburner, Sep 17, 2021
  7. stasha

    stasha Karting

    Sep 10, 2021
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    steve steve
    #7 stasha, Sep 17, 2021
    Great info.
     
    moysiuan likes this.

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