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Thread: M931A1 help

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    Default M931A1 help

    Our fire dept built a water tender out of a M931A1 we may need to add auxiliary braking system we need to know if it can be done. If so has anyone done it??


    Gene

    Fire Chief

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    Gene....you will have to give more details. What do you mean by auxiliary? The M931A1 air brakes have glad hands to run a trailers air system. Or do you mean changing the 931 wedge type to S-cam?
    M35A3 4x4 "Money Pit"
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    The inspection checklist for sending truck to fires now says " All vehicles 36,000 GVWR or greater shall be installed with an operator-controlledauxiliary braking system in addition to the service brakes (i.e., engine retarder,transmission retarder, driveline retarder, or exhaust retarder " so guess my Question is can I add one of theses to this truck?

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    Quote Originally Posted by genefireguy View Post
    The inspection checklist for sending truck to fires now says " All vehicles 36,000 GVWR or greater shall be installed with an operator-controlled auxiliary braking system in addition to the service brakes (i.e., engine retarder,transmission retarder, driveline retarder, or exhaust retarder " so guess my Question is can I add one of theses to this truck?

    The truck already has air powered wedge brakes at six wheels, so the E-Brake at the T-case should be considered an auxiliary brake .

    I have 2 6x6 tenders and they have never questioned this on mine, one is a Deuce and the other a M931A2, assuming yours is the same ...
    1952 GMC XM211 Water Truck (For Sale)
    1963 Studebaker M50 Water Truck
    1991 BMY M931A2 Tractor currently being converted to water truck

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    Quote Originally Posted by Valley Rock View Post
    The truck already has air powered wedge brakes at six wheels, so the E-Brake at the T-case should be considered an auxiliary brake .

    I have 2 6x6 tenders and they have never questioned this on mine, one is a Deuce and the other a M931A2, assuming yours is the same ...
    Then you need to install a standard tractor parking valve so you can use your emergency brake without it locking the spring brakes up.
    2008 F-250 6.4L Powerstroke
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, Oshkosh 55000 Transfer Case, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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    If the emergency brake that is on the truck works, like VR says, you have a "drive-line retarder". No jake required...just make sure the e-brake is working, has lining on the shoes and is in adjustment.
    M35A3 4x4 "Money Pit"
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    Ya I don't see where the secondary brake system has to be completely separate in acuation from the standard brakes, it just has to be there, so if you pull the brake handle up and the main brakes don't work, you still have the E-brake which is manually activated and will still function .

    It is purposely designed this way (obviously) for a reason, that reason being that the soldier in the field doesn't have to think twice or grab a second lever, one and done .

    Don't over think it, they just want a back up fail safe, the fact that it is on the same lever should have nothing to do with it .
    Last edited by Valley Rock; 05-18-2019 at 18:20.
    1952 GMC XM211 Water Truck (For Sale)
    1963 Studebaker M50 Water Truck
    1991 BMY M931A2 Tractor currently being converted to water truck

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    All A2 trucks have the mounting location for a push pull parking brake valve to be installed. The hole in the bracket that goes from the shifter to the dash board. Enlarge it. T your supply for the valve off of your spring brake override supply. This still is a spring brake tank air supply.

    Plug the supply port off behind the drivers step and connect a union the spring supply and run it to the parking valve.

    Cost is around $75 for everything.
    2008 F-250 6.4L Powerstroke
    1984 AM General XM923A4 ( Big Cam III NTC-400, HT4B turbo, Intercooled, #10 button, Dual fuel Line setup - MRAP Aluminum Radiator - 7" Ram Air Intake system - Dual 115 gallon tanks - Air Conditioning - 145amp alternator - Puradyn Oil Bypass system, CAT 7155 16speed transmission, Oshkosh 55000 Transfer Case, riding on 16.00 AT-3s on HEMTT wheels. )
    M923A1
    M931A2
    M1083
    M1078
    M796 Bolster
    M322 Equipment Trailer
    MEP-804A


    901-318-8353 for Help in and or around the Memphis area or transporting in the southeast. Text me first before calling.

    Tires (HMMWV, 395s, 1600s) and Transportation Vendor

    Wes

    Videos at https://www.youtube.com/results?search_query=5782simp

    https://www.youtube.com/channel/UCTd...D4dOJidPFnmYGA

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    Quote Originally Posted by simp5782 View Post
    All A2 trucks have the mounting location for a push pull parking brake valve to be installed. The hole in the bracket that goes from the shifter to the dash board. Enlarge it. T your supply for the valve off of your spring brake override supply. This still is a spring brake tank air supply.

    Plug the supply port off behind the drivers step and connect a union the spring supply and run it to the parking valve.

    Cost is around $75 for everything.
    My guys are asking if you have any pictures of this if you have already done this.


    Thanks Gene

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