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Hydro Vac Brake Boosters

Discussion in 'Early CJ5 and CJ6 Tech' started by mickeykelley, Nov 2, 2021.

  1. Nov 9, 2021
    colojeepguy

    colojeepguy Colorado Springs

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    :n:
     
  2. Nov 9, 2021
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I won't knock the extra safety factor of a dual master cylinder, but in reality has anyone ever been aware that one half of their braking system failed?
     
  3. Nov 9, 2021
    colojeepguy

    colojeepguy Colorado Springs

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    Yes
    Also, I've actually suffered complete brake failures twice, on single master cylinder vehicles.
     
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  4. Nov 11, 2021
    Tom_Hartz

    Tom_Hartz Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    North Carolina
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    We find this all the time at work also.
     
  5. Nov 11, 2021
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Hills of NH
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    Yes, and me too on the singles. But nothing bad ever happened. Pump like hell and pray...

    Used to be relatively commonplace. But less traffic back then.
     
  6. Nov 11, 2021
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    I bought a wrecked '69 Series 2 Land Rover about 15 years ago that was wrecked pretty hard in the front. It was from a total brake failure of the single master cylinder. The previous owner ended up dying of his injuries about 3 weeks after the crash. It happens!
    -Donny
     
  7. Nov 11, 2021
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I realize that a single reservoir M/C failure can have hazardous results. I'm just wondering who has had half of a dual system fail and when it happened did they instantly realize it happened.
     
  8. Nov 11, 2021
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Post Falls, ID
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    I’ve had it happen a few times. You definitely notice it. It’s one of those instances when two minus one does NOT equal one. :shock:

    I vowed to build my brakes differently on my last build because of this. If it’s going to be scary if one fails, I at least want it predictable.
     
    Glenn likes this.
  9. Nov 11, 2021
    Jw60

    Jw60 WRPD855 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    I'ld bet the caliper had semi metallic pads if packaged together.
    If that doesn't help than you aren't out a whole lot of time or expense.

    Fwiw I have gm calipers on all 4 corners with organic pads and the original 7/8 bore single master cylinder. my wife seems comfortable with it. I am switching to a stepped bore master for redundancy and some initial proportioning.
     
  10. Nov 11, 2021
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    I assume would need to turn the rotors so the new organic can seat?

    Also I found this on a brake site and found it interesting.

    Organic brake pads are usually the least expensive choice when it is time for a brake job. They are relatively “soft”, quiet, and gentle on your brake system, and they are a good choice for daily driving. But they wear out quicker than other types of pads and produce significant amounts of dirty brake dust. And because they are softer, they require a bit more effort against the brake pedal. They also do not tolerate overheating very well and are therefore not a good choice for performance use. For all around use, they are just fine.

    PROS:

    • Soft pedal
    • Gentle on brake system components
    • Quiet
    • Inexpensive

    CONS

    Require more effort when braking
    • Wear quickly and require more frequent replacement
    • Dirty

    Not suited for performance or heavy-duty use
     
    Last edited: Nov 11, 2021
  11. Nov 12, 2021
    garage gnome

    garage gnome ECJ5 welder 2021 Sponsor 2020 Sponsor

    Western MA
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    Just had this happen to my pickup. Front right line blew, didn't notice it under normal braking until I had to do a panic stop and the pedal went to the floor.
     
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  12. Nov 12, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    This happened to me with my J10 maybe a decade ago. The line between the rear wheels rusted through. Fortunately it happened in the Home Depot parking lot. The pedal travel increases a lot, but the brakes still "work."
     
  13. Nov 12, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    What site? I suspect they are wrong or there's some other qualification that makes it true in some specific situation. Possible it requires more effort when the brakes are hot and you make repeated panic stops? At that point, there could be fade with the organic pads that you would not see with harder pads, and you need more strength to overcome the fade. Clearly not the case around town - too many here have used these pads and noted the easier braking.
     
  14. Nov 12, 2021
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Brakes were fine in my '85 F250 until I went to leave work one night....pedal went straight to the floor. Didn't need to do anything other than replace the M/C. :shrug:
     
  15. Nov 12, 2021
    mickeykelley

    mickeykelley Well-Known Member

    Republic of Texas
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    Columbia Auto Care and Car Wash | Mobil 1 Lube Express
     
  16. Nov 12, 2021
    Howard Eisenhauer

    Howard Eisenhauer Super Moderator Staff Member

    Tantallon, Nova...
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    My immediate reaction is that these people are probably *NOT* to be considered authoritative experts on the subject.

    Car washing perhaps, but probably not.

    There's a number of people here with real-world experience in this subject, I'd be inclined to listen to them.
     
  17. Nov 12, 2021
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    I know a couple.

    Once when they were in traffic court their buddies were out in the parking lot, greasing the front discs on the police cruiser...
     
  18. Nov 12, 2021
    mickeykelley

    mickeykelley Well-Known Member

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    Not even gonna touch that one…….
     
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  19. Nov 13, 2021
    Andrew Theros

    Andrew Theros Member

    Los Osos, CA
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    Those fine Fellows just happened to notice that that cruiser’s discs were a bit dry…:whistle:
     
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