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Under-Cab Power Brakes and Dual Master

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  • #16
    Very Nice Greg!
    Well thought out.
    TGP
    WDX & Misc. Pics.
    http://www.t137.com/cpg/index.php?cat=10010
    "47" Dodge WDX WW
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    "86" Chev, M1028A2 (K30) 6.2,400.205,4.56 Locker
    "99" Dodge Durango "Limited Slip"
    "99" Dodge 3500 CTD 4x4"No-Spin"

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    • #17
      Looks awesome! Have you thought about a skid plate for it?

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      • #18
        Good Idea

        Originally posted by CSCameron View Post
        Looks awesome! Have you thought about a skid plate for it?
        I had not thought about that, went back and checked, it wouldn't be over kill, in my opinion. Is the reservoir accessed from the cabin floor?

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        • #19
          Skid plate

          I thought about a skip plate early in the design process, but I decided to put the bracket high under the cross member to keep it out of harms way. The bottom of the bracket is higher than the bottom of the transfer case, and only 1 3/4" below the bottom of the frame rail. It's also much higher than the bottom of the front axle. It's possible that something could hit the bracket, but I think the transfer case will get hit at the same time, which will either take the brunt of the inpact, and/or take the truck out of commission.

          Reservoir access: At this point I'm not sure where the reservoir sits in relation to the floor board and seat base. I think, give the booster I'm using (single diaphragm 7"), that the center of the reservoir cap will be near the rear of the floor board opening. I'm planning to access the cap from under the truck, but pulling the floor board may be easier. Either way, it will be easier than in the stock position. With a double diaphragm booster, the reservoir will be near the center of the floorboard. I'll do some measuring tonight and post the results.
          Attached Files
          Greg Coffin
          Unrepentant Dodge Enthusiast

          1951 Dodge M37 - Bone Stock
          1958 Dodge M37 - Ex-Forest Service Brush Truck
          1962 M37-B1 - Work in Progress
          1962 Dodge WM300 Power Wagon - Factory 251, 4.89s
          1944/1957 Dodge WM500T 6x6 Power Wagon - LA318-3, NP435, 5.83s, Power Steering, Undercab Power Brakes
          1974 Dodge W200 - 360/727, Factory Sno-Fighter Package

          Comment


          • #20
            Looking good, but be ware not all obstacles are flat/symmetric, so it's still prone.
            I drive a DODGE, not a ram!

            Thanks,
            Will
            WAWII.com

            1946 WDX Power Wagon - "Missouri Mule"
            1953 M37 - "Frankenstein"
            1993 Jeep YJ - "Will Power"
            1984 Dodge Ramcharger - "2014 Ramcharger"
            2006 3500 DRW 4WD Mega Cab - "Power Wagon Hauler"

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            • #21
              Yes, there is a chance the bracket could be hit. The issue is that I don't know how to transfer the stresses of a hit through to the chassis without making the booster, master and linkages inaccessible. So for now I don't have a skid plate.
              Greg Coffin
              Unrepentant Dodge Enthusiast

              1951 Dodge M37 - Bone Stock
              1958 Dodge M37 - Ex-Forest Service Brush Truck
              1962 M37-B1 - Work in Progress
              1962 Dodge WM300 Power Wagon - Factory 251, 4.89s
              1944/1957 Dodge WM500T 6x6 Power Wagon - LA318-3, NP435, 5.83s, Power Steering, Undercab Power Brakes
              1974 Dodge W200 - 360/727, Factory Sno-Fighter Package

              Comment


              • #22
                Greg, it's still awesome! Thanks for taking on this project and showing us the progress.

                Comment


                • #23
                  Just curios regarding your thoughts on the belcrank leverage / arm throw issue, would you of preferred it to of been like 1:1.5 instead of 1:1 or ?

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                  • #24
                    I measured as much as I could the best I could during the design phase. Now that it's all together I should have made the master cylinder arm 12% longer than the pedal arm to get full motion out of the master cylinder. The next version of the bracket will take this into account.
                    Greg Coffin
                    Unrepentant Dodge Enthusiast

                    1951 Dodge M37 - Bone Stock
                    1958 Dodge M37 - Ex-Forest Service Brush Truck
                    1962 M37-B1 - Work in Progress
                    1962 Dodge WM300 Power Wagon - Factory 251, 4.89s
                    1944/1957 Dodge WM500T 6x6 Power Wagon - LA318-3, NP435, 5.83s, Power Steering, Undercab Power Brakes
                    1974 Dodge W200 - 360/727, Factory Sno-Fighter Package

                    Comment


                    • #25
                      Thank you for this valuable info. Your time and expertise is much apreciated..

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                      • #26
                        Correction to my last post: I should have made the master cylinder arm 25% longer than the pedal arm (not 12%). Both arms are 2" long right now, and I plan to make the master cylinder arm 2 1/2" long on the next version. I've also figured out how to fit a bellows over the booster push rod, to help keep dirt and moisture out of the air intake. I'll run a remote air intake into the cab, behind the seat. I drove an old Ford cabover that had a setup like it. I just have to find a shock absorber bellows that I can make fit.

                        Here are the booster and master cylinder numbers for people who may be interested in that info:

                        7" Brake Booster: Tuff Stuff 2221NB
                        Master Cylinder: Dorman M101266, 1-1/4" bore

                        The booster and master cylinder fit together perfectly, much to my surprise and relief!
                        Greg Coffin
                        Unrepentant Dodge Enthusiast

                        1951 Dodge M37 - Bone Stock
                        1958 Dodge M37 - Ex-Forest Service Brush Truck
                        1962 M37-B1 - Work in Progress
                        1962 Dodge WM300 Power Wagon - Factory 251, 4.89s
                        1944/1957 Dodge WM500T 6x6 Power Wagon - LA318-3, NP435, 5.83s, Power Steering, Undercab Power Brakes
                        1974 Dodge W200 - 360/727, Factory Sno-Fighter Package

                        Comment


                        • #27
                          Very good! Keep the updates coming...

                          Comment


                          • #28
                            Thanks for the update / clarification, we appreciate the time involved and information you have supplied.

                            Comment


                            • #29
                              I made some changes to the bracket today. I moved the lever pivot 1-1/2" to the rear to make room for the bellows. I also extended the booster arm length to 2-1/4" to see how it will perform. This bracket isn't set up to allow the needed 2-1/2" arm length, so 2-1/4" will have to do.

                              The bellows fits and works great. It's a rack boot for a Ford Exploder. I was fortunate to find a counter man who had a creative bone in his body. He found it on the first try.
                              Attached Files
                              Greg Coffin
                              Unrepentant Dodge Enthusiast

                              1951 Dodge M37 - Bone Stock
                              1958 Dodge M37 - Ex-Forest Service Brush Truck
                              1962 M37-B1 - Work in Progress
                              1962 Dodge WM300 Power Wagon - Factory 251, 4.89s
                              1944/1957 Dodge WM500T 6x6 Power Wagon - LA318-3, NP435, 5.83s, Power Steering, Undercab Power Brakes
                              1974 Dodge W200 - 360/727, Factory Sno-Fighter Package

                              Comment


                              • #30
                                That's a quality piece of work! Thanks for sharing.

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