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Under-Cab Power Brakes and Dual Master

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  • #31
    Final Installation

    I got the final touches done to the bracket and painted it. Last week I installed the fittings to connect the master cylinder to the front and rear brake lines. The red fittings are 10psi residual pressure valves, since the master cylinder doesn't appear to have any. All the pictures I've seen of dual circuit systems have a brake light switch on each of the circuits. I have no idea why, other than that the brake lights will work if one of the circuits goes down (if my brakes fail the last thing I'm going to worry about is whether my brake lights are on!). But I figured there's a good reason, so I did the same thing. If someone knows why, please tell me!

    I installed everything this afternoon and my boys helped me bleed the brakes. The system appears to work very well. The pedal is very firm, and stops solidly at about 3" of travel, or about 30% of total travel to the floor board. I'm debating whether to add another 1/4" to the booster arm on the next bracket. The longer arm gives less mechanical advantage, and I don't yet know how much boost I will get from the 7" booster. The longer arm may also make the brakes a little touchy, which I want to avoid. I won't know until the truck is on the road. Right now I figure I'm getting 90% of the master cylinder capacity before the pedal hits the floor board.

    The last item to figure out is the pedal return spring. I can't use the factory location because the brake rod is in the way. I thought about using the factory spring and welding an arm at the bottom of the brake lever (black illustration), but it hung too low and I didn't like the look of if. After some more head scratching I'm going to try mounting a spring in the area of the red line. Now I just have to find the right spring.
    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


    • #32
      Kind of a fun view
      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


      • #33
        WOW looking great and sounding wonderful! Great work and update.
        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"

        Comment


        • #34
          Dang

          That looks like it's supposed to be there!

          Comment


          • #35
            Pedal Spring Installed

            Thanks guys, I appreciate your compliments. It's fun to build things that look like they belong.

            I got the pedal spring installed today. I bought a couple different ones to play with. Ended up using a very heavy spring that was about 3 3/4" long. The anchor points are 1/4" Grade 8 nuts welded to the pedal arm and the clutch master bracket. In the photo the nuts are just tacked in. They were very hard to reach with the mig torch. Now the pedal snaps back into place like it should. Here's a couple photos.
            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


            • #36
              All for now....

              This about wraps up any updates for the Under-Cab Master project until I get the truck on the road - hopefully by this summer. I will be making another style of bracket that will take up to an 8" single or double diaphragm booster. I'll post some pictures once I get the prototype fabricated. If people are interested in a bracket, let me know and I'll see what it would cost to make a few. Best way to contact me is via email at gregcoffin2.0 at gmail dot com
              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


              • #37
                Excellent, I to wondered about what kind of pain was to come of the return spring placement, you did good.

                Comment


                • #38
                  Getting Ready to Build Rev B

                  Last night I made the final revisions for Rev B of the under-cab master cylinder bracket. The new design is going to save a lot of fabrication time, and will be more versatile than the earlier design. The new design also allows a hydroboost unit to be mounted instead of a vacuum booster.

                  Before I send the drawings to the waterjet cutter I'm going to build a cardboard prototype to make sure I haven't missed something in the design. If the mockup works I will send the drawings out this week and I hope to have the parts back in a couple weeks. I have 3 orders for brackets at this point, and I hope to ship them out by mid-August.

                  I'll post pictures as things progress.
                  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


                  • #39
                    Ahab65, are you getting my emails?

                    Ahab65, I've been getting your emails, but I don't think you are getting mine. Please check your spam file, and put my email on your white list, gregcoffin2.0 at gmail dot com. Hopefully we will connect soon!

                    I'll post some pictures of Rev B this week.
                    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


                    • #40
                      Greg,

                      I will get you on my "white list" so we can connect soon. Sorry for the silence, dang spam folders anyway.

                      Thank you.

                      Comment


                      • #41
                        Ahab65, I've sent you 2 emails, please let me know if you received them.
                        Thanks!
                        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


                        • #42
                          I did not get your emails. Did you get the email I sent you yesterday (Fri)? I will email you my work address and you can contact me there. Sorry for the mess. Thanks.

                          Comment


                          • #43
                            revision B update

                            Any updates on Revision B? I'm getting ready to tear my 48 powerwagon apart and install a 315 hemi repower. I'm interested in the bracket.

                            Comment


                            • #44
                              Rev B is a reality. They are set up to take either a 7" or 8" vacuum booster, or a hydrobooster. I will take some pictures tomorrow and post them. I have 1 bracket left from the last batch. It's set up for a vacuum booster.
                              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


                              • #45
                                Here are a couple pictures of the Rev B brackets. The first picture is of the complete kit. The second picture shows an assembled bracket with a 7" Tuff Stuff single diaphragm vacuum booster. An 8" booster will also fit on the bracket. I can also set up the bracket to mount a Dodge or Chevy hydroboost unit.

                                The kits are $350.00, and shipping is about $45.00. I can send you the installation instructions if you want to look at how it all goes together.
                                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

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