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Thread: Deuce Power Bleeder R4x4 Style

  1. #21
    Moderator m16ty's Avatar
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    All the power bleeder does is it allows one person to bleed the brakes (you don't need soldier B to pump and hold the brake pedal) and it insures you don't pump the MC dry. It is possible to bleed the brakes without fluid in the sprayer but you're going to have to keep tabs on the MC fluid level to make sure it doesn't run dry. If your MC runs dry you'll have lost everything you've done to that point and will have to start all over. It's much better to have fluid in your sprayer to refill the MC as needed during the bleeding process.
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    3 Star General peashooter's Avatar
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    Default DUAL CIRCUIT POWER BLEEDER ideas

    Quote Originally Posted by sandman7655 View Post
    What about us guys with dual brake systems.you cant get to the mc cap like that it is on the front end of mc and it is a plastic sealed cap.Any ideas would be helpful.
    I found some Master cylinder resevoir caps that will mount to the late model A2 trucks with the dual circuit brakes. My intention is to build a power bleeder similar to the single circuit units sometime but not sure when I'll get to it. So here is the info on the caps in case someone wants to beat me to it.
    They are DORMAN part # 42044 and come with 2 caps but no gaskets, the set cost me $5 from Oreilly auto parts. The picture below shows the caps. The cap on the upper right is the stock cap from my truck. The only difference is that these caps say "use only Dot 3" which you can scratch off or whatever.

    The MC resevoir also has a 1/4" flexible plastic ventline that comes out of it and (on my truck) goes up to the firewall area by the steering column. So perhaps using these caps isnt the best way to go about building a power bleeder since you would have to plug the vent line. Perhaps just tapping into the ventline closer to the M/C is that way to go?
    If anyone builds a power bleeder for the dual circuit system, post it up here as I'd love to see it. If/when I build one I'll be sure to post it as well.
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  3. #23
    Moderator, wonderful human being & practicing Deuce Doctor. Steel Soldiers Vendor clinto's Avatar
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    Quote Originally Posted by peashooter View Post
    I found some Master cylinder resevoir caps that will mount to the late model A2 trucks with the dual circuit brakes. My intention is to build a power bleeder similar to the single circuit units sometime but not sure when I'll get to it. So here is the info on the caps in case someone wants to beat me to it.
    They are DORMAN part # 42044 and come with 2 caps but no gaskets, the set cost me $5 from Oreilly auto parts. The picture below shows the caps. The cap on the upper right is the stock cap from my truck. The only difference is that these caps say "use only Dot 3" which you can scratch off or whatever.

    The MC resevoir also has a 1/4" flexible plastic ventline that comes out of it and (on my truck) goes up to the firewall area by the steering column. So perhaps using these caps isnt the best way to go about building a power bleeder since you would have to plug the vent line. Perhaps just tapping into the ventline closer to the M/C is that way to go?
    If anyone builds a power bleeder for the dual circuit system, post it up here as I'd love to see it. If/when I build one I'll be sure to post it as well.
    Much thanks to Peashooter for his assist here. I have a customer's M35A3 here that needed a system flush. Here's what I did:

    Using the aforementioned Dorman 42044 caps and the Dorman 420814 gaskets, I built a pressure bleeder adapter for the firewall mounted M44A3 reservoir.

    20140301_201946.jpg42044.jpg
    I took the new cap and drilled a 15/32" hole in the center. Be advised you can probably make the hole a little larger, like 31/64" or perhaps even 1/2". I wanted the air fitting to screw in very tightly.

    I then screwed a Milton M-series 727 fitting into the cap. This will work with the factory fitting on your Motive Power bleeders and is the most common quick disconnect out there.

    20140301_202304.jpg20140301_202509.jpg

    On the bottom, I used JB Weld to ensure no air or fluid could escape from where I'd mounted the quick disconnect fitting or through the small vent line that is molded into the bottom of the caps.

    You'll also need to cut out the center of the gasket, so brake fluid can get into the reservoir.

    20140301_202342.jpg20140301_202406.jpg

    After doing this, I was able to get up to 12 lbs of air pressure (psi obviously) without the cap leaking brake fluid. This is more than enough to properly bleed and/or flush the brake system on an M44 series (A2 or A3) truck.

    20140301_143714.jpg

    If you have the three fittings shown below, you can bleed any M44 series truck except the 1987-1989 dual circuit USAF A2C's. I will show how to do those in the near future.

    20140301_202618.jpg20140301_202632.jpg
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    Default Doing it R4x4 Style!

    This thread is great! Thank you Recovry4x4 for starting the discussion and posting the pictures!

    Using Recovry4x4's pictures, I purchased a one-gallon sprayer at Home Depot and everything else from my local hardware store. They can be more expensive, but I like to support the local stores. I acquired all of the parts and assembled the sprayer today. The breaks on my truck will be bled next weekend.

    The table below shows my parts list and the associated cost. I had to purchase everything except for the air line quick couplers, which I had already.

    The parts are listed in order starting with the sprayer and ending at the master cylinder cap:

    HDX 1-Gallon Multi-Purpose Sprayer $9.97
    1/4" ID X 1/4" MPT Hose Barb $2.99
    1/4" Chrome Ball Valve $13.99
    1/4" X 1-1/2" Red Brass Nipple $2.99
    Air hose quick coupler - Female N/A
    Air hose quick coupler - Male N/A
    1/4" ID X 1/4" MPT Hose Barb $2.99
    1/4" clear tubing (2' in length) $0.66
    1/4" ID X 1/8" MPT Hose Barb $1.79
    0-100 PSI Pressure Gauge $13.49
    1/8" Brass Tee $5.29
    1/8" X 5" Red Brass Nipple $4.79
    1/4" - 5/8" Hose clamps (3 @ $1.99 each) $5.97
    Total cost $64.92



    Deuce Break Power Bleeder Pic1.jpgDeuce Break Power Bleeder Pic2.jpg
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    4 Star General m715mike's Avatar
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    Quote Originally Posted by Recovry4x4 View Post
    Here's a tip from the old school brake guy. When you open a system on the deuce and you know that the system has air in it. Pick one wheel far away and bleed it untill you get that mass of air out. From there bleed the rest of the system. I see the novice deuce brake bleeding guys don't wait long enough on that first wheel and get the air split up in several lines!

    I still have a question after re-reading this thread. There will be air in the line on the power bleeder from the sprayer tank to the master cylinder cap when you first pressurize the sprayer tank. Does this air cause an issue? I assume that the air will be injected into the break system on the truck. Is the solution to simply "get that mass of air out" by first bleeding at the right rear wheel cylinder? Is there a better technique?
    1972 Reo Motors M35A2 w/w
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    Previously owned:
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    1967 Kaiser M715

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    I like mine, commercial, wasn't much. and I use a NAPA tube check valve thing on the bleed fitting.
    bleeder brake reservoir 1.jpg
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    It doesn't cause a problem. I try to fill the MC all the way to the top and put the cap back on and make sure there is fluid all the way out to my quick connect before I hook it up. No problems doing it this way for the last 1.5 yrs
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  13. #28
    LLM/Member 785 Recovry4x4's Avatar
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    The air will accumulate at the top of the master cylinder. As the master cylinder pressurizes all the air will rise to the top. You won't push air through the fluid already there!
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    A giant THANK YOU to Recovery4x4, Clinto and Peashooter for this thread and the contributions made to it!

    I had to replace all 4 brake lines on the rear axles of my M35A3.

    By using the information provided in this thread, I was able to successfully and singlehandedly bleed the brakes on my Deuce in a very short time.

    The Steel Soldiers community is wellspring of information and advice if one will only search for it!

    Thank you again gentlemen!
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    did you ever do one for the USAF A2C ?

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