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Thread: How do you stop a m809 if the brakes fail?

  1. #41
    Colonel US6x4's Avatar
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    They make pinion brakes all day long for the axles. Might be a secondary option 5-TON-OVRT.png

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    Colonel Ajax MD's Avatar
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    Quote Originally Posted by US6x4 View Post
    They make pinion brakes all day long for the axles. Might be a secondary option 5-TON-OVRT.png
    Say, that's very interesting! How is it actuated? Parking brake handle or something else? I'm guessing it's hydraulic and not cable actuated?
    Motorpool:

    (Isn't owning one of this insanity enough??)
    1971 M813 "Ox" (named for Dewey Oxburger)

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    2 Star General 319cssb's Avatar
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    Oh yeah i remember seeing brakes like that on mud trucks. I think they do that as the wheel brakes usually are wet and full of dirt. That sounds like a great option. I gotta google that.
    I will either find a way, or make one!
    --------------------------------------------------------------------------------------------------------
    I hate people, who use big words just to make themselves look perspicacious.

    1988 M813
    1987 M1028A2
    1084 M1009
    1997 M1078

  4. #44
    4 Star General porkysplace's Avatar
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    Quote Originally Posted by 319cssb View Post
    Oh yeah i remember seeing brakes like that on mud trucks. I think they do that as the wheel brakes usually are wet and full of dirt. That sounds like a great option. I gotta google that.
    There is a lot of information on pinion brakes in this from the Deuce forum.
    Pinion brakes


  5. #45
    Colonel Ajax MD's Avatar
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    Quote Originally Posted by porkysplace View Post
    There is a lot of information on pinion brakes in this from the Deuce forum.
    Pinion brakes
    Hm. They ain't all that and a bag of chips. Mainly, I was curious about them as a better parking brake and *maybe* an e-brake in case of service brake system failure.
    Motorpool:

    (Isn't owning one of this insanity enough??)
    1971 M813 "Ox" (named for Dewey Oxburger)

  6. #46
    Former SSG 98G's Avatar
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    Quote Originally Posted by Ajax MD View Post
    Hm. They ain't all that and a bag of chips. Mainly, I was curious about them as a better parking brake and *maybe* an e-brake in case of service brake system failure.
    Consider the rear diff ratio of 6.44:1. This makes a pinion brake useful only for very low speeds (which is where you see them used....)

    Using a pinion brake to try to make an emergency stop from even 45mph will just illustrate how kinetic energy will transform into heat and melt it. There's just not enough room under there to fit in enough mass to absorb the heat.

    Full airbrakes are much to be preferred. Second to that would be a dual circuit (not available for 809series).

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    2 Star General 319cssb's Avatar
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    Speaking of 809 , where can i find definete information about the model years. I just saw a 1988 (whaaaaa???) M813A1.
    someone said something about models being still produced after the model ended. I can see that happening for a year maybe . But 6 years?
    I will either find a way, or make one!
    --------------------------------------------------------------------------------------------------------
    I hate people, who use big words just to make themselves look perspicacious.

    1988 M813
    1987 M1028A2
    1084 M1009
    1997 M1078

  8. #48
    Former SSG 98G's Avatar
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    Quote Originally Posted by 319cssb View Post
    Speaking of 809 , where can i find definete information about the model years. I just saw a 1988 (whaaaaa???) M813A1.
    someone said something about models being still produced after the model ended. I can see that happening for a year maybe . But 6 years?
    I speculate that manufacture dates on the data plates were occasionally changed when going through rebuild. I've seen
    Manufacture dates on 939A0series trucks as late as 2007.

    And we drift off topic.....

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