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Roller track cracked ears,

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  • Roller track cracked ears,

    cracked ears finally,

  • #2
    Just in case, (depending on where ordered), please note that Mr. Bratton mentions in his Catalog that some of these roller tracks offered by others are made with soft metal, may not be heat-treated and may wear quickly.

    In my opinion, past wear on these roller tracks contributed to the ever so many complaints about Model A mechanical brakes years ago.

    Years ago one could hear quite often: "Yes, I am still driving my old Model A" ..... followed by a new car owner's typical response, "And how are your brakes?"

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    • #3
      Were they cracked when you were centering shoes?

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      • #4
        Never mind, found your other post

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        • #5
          I usually weld up the originals and grind down. There is always enough original track there to act as a template

          To me this is the single biggest weakness of the mechanical brake setup. If you watch the motion carefully when you get done, no matter the method, you will see most of the time the rollers do not roll as they are claimed, but slide.

          Not much can be done about that, but I grease'em up real good with that heavy red grease Tom likes

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          • #6
            I find the same thing as Dave, and I also weld and grind. These never were meant to be bent and never should be bent, and that's why they now have cracks. Since they are off, just install new ones. I think it's been stated somewhere to bend them, but even if they could be bent, the riding surfaces between the two would no longer be parallel.

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            • #7
              I have never re-shoed a Model A, guess I am in for a rude awaking.

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              • JDupuis
                JDupuis commented
                Editing a comment
                It's not that bad.
                I quite enjoy the rebuild process. Jeff

            • #8
              It takes a certain mindset. And when you are done, if done correctly, it will all outlast you by decades

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              • #9
                Thanks Tom & everybody, That just goes with my gut feeling. You just cannot bend metal without doing damage. The car did not have original roller tracks when I got it. So now I have to ask, "how do you center the shoes when re doing the brakes?"

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                • #10
                  I think the dealers sell a centering checking tool. Flathead Ted sells pins with 4 flat sides to adjust the height, if they need to be moved.

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                  • #11
                    FWIW Past experiences:

                    Appears it is always a good thing that everybody does not think alike, either accurately and/or inaccurately, and/or either inside or outside the box; hence, when a delicate "Life Saving" Model A brake question is asked, and several different responses are presented, one can choose from multiple choice answers and/or solutions.

                    A. Ford's mechanical engineers very precisely set the horizontal surfaces of both sides of front roller tracks at a perpendicular vertical distance of 4.620" below the center of the front backing plates as illustrated on their Shop Drawings. (Re: message 05-04-2017-12:17 pm, by Mr. Brent; also Mr. Marco's August 20,1998 12:53:19 Ahooga message, (A Little Trivia), who mentioned this dimension as approximately 4.625" or 5/8"; however, in using either dimension, one is well within .005" of important vertical brake shoe centering.) Thanks to Mr. Brent & Mr. Marco!

                    B. Every time these Model A roller track rivets were and/or are presently removed for replacing worn tracks, the former backing plate rivet holes were and/or are enlarged as new rivets were installed and hammered; hence, centering new rivets in these enlarged rivet holes was and still is a challenge to try to maintain these 4.620" exact and delicate roller track dimensions.

                    C. The front backing plate on my Town Sedan had elliptical off-centered rivet holes after the old rivets were removed 12 years ago.

                    D. I made a manila folder/wood template device to fit inside the centered front axle hole in the backing plate which also indicated this precise 4.620" vertical dimension on both sides of the track.

                    E. Next, on one backing plate, I hammered the rivets a little at a time while adjusting both sides of this vertical dimension of the movable roller tracks while using an adjustable wrench ...... the wrench was allowed to move and adjust this track, but did not bend the track.

                    F. On the other backing plate I filled the backing plate rivet holes with weld, used a centering punch, (and template), to locate a new roller track rivet holes, and drilled new rivet holes positioned to maintain this 4.620" roller track perpendicular dimension.

                    G. Used Bratton's no.2420 heat treated tracks with Bratton's no. 2870 floaters which helps to center brake shoes in the horizontal direction. (Ford provided a similar device on rear brakes).

                    H. Used Bratton's no.2695 centering tool to further center and fine tune bonded brake bands in cast iron drums provided by Mr. Mel Gross.

                    I. Also, if interested, "Permatex" makes a reliable brake caliper lubricant, regular and synthetic that really sticks to metal after several thousand miles of use.

                    J. To share Model A shopping, (LOL), I bought my rear brake parts from Steve at Bert's ..... no problems either.

                    K. Just hope this helps to do it once with a roller track installation plan.

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                    • #12
                      Might add that in above reply no.11, (re: Mr. Marco), he noted 20 years ago that before 1931 soft, front metal tracks were installed and milled to this exact 4.625" dimension; however, I'm guessing that possibly because of excess later roller track wear, in 1931, heated treated tracks were provided on new Fords, and also provided to dealers for replacing worn, non-heat-treated tracks.

                      Could be that worn, softer roller tracks on Model A's prior to 1931 may have been replaced.

                      And, also thanks to Mr. Bratton for being aware of this Model A track wear problem and his sincere caring and providing new no.2420 "heat treated" tracks made from exact Ford prints.

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                      • #13
                        HL exactly where is this dimension referenced to again? The actual center of the hole in the backing plate? That is gonna be hard to do unless the plate is off. Even then finding the center of such a large hole won't be easy

                        Is there a pix somewhere you can link to?

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                        • #14
                          Here is a picture, I think Brent posted this.

                          Bob

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                          • #15
                            OK, if the 4 mounting holes are equidistant then the intersection of the centers of those holes will define the center of the larger hole

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