Trying to piece together some rear drum brakes from a pile of parts!

Brakes, Steering & Suspension

  1. Kern Dog

    Kern Dog FBBO Gold Member FBBO Gold Member

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    With the chance of the swap meets and car shows being cancelled, instead of waiting to scrounge for brake stuff, I'm looking to piece together some stuff together myself.
    I have 5 axles here that don't have brakes on them. I have been looking for 10 inch setups since they are light and work great for the A bodies and even the street driven B body stuff.
    I have 3 sets of backing plates, 2 sets look like this:
    Brake B.jpg
    They have that U shaped stiffener bracket visible above the wheel cylinder hole.
    I have a pair of these as well:
    Brake BB.jpg
    They look otherwise identical.
    I have a bunch of 2 1/2" shoes I can use, a bunch of springs and pins but I am missing the parking brake lever that hinges from the rear shoe and the horizontal flat bar that pushes against both shoes.
    This 11" setup is here to help me figure where everything goes:
    Brake AX.jpg

    I'm also tempted to pull the drums off of a car out back to see what it looks like inside. I have seen some slight differences in the hardware throughout the years. I've worked on Mopar stuff from the mid 1960s through the late 80s and seen differences like this:
    Brake BBB.jpg
    Does anyone have some pictures of their drum brake assemblies that I can use for reference?
    Since I have 5 axles and only three sets of backing plates with all sorts of parts missing, I would LOVE to hear from members willing to sell their take-off 10" assemblies. Short of that, I'd appreciate assembly advice or any suggestions on where to find the parts that are not being reproduced.
    Thanks!
     
  2. R413

    R413 Well-Known Member

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    The rusted one you have pictured is 1970 and newer hardware. Up to late 70 somewhere, unsure exactly.

    Top picture below is a 1967 10” with the wheel cylinder removed, everything else is in place.

    note the difference in the cable end and the lever for self adjusting. Here it has a tab that goes into a hole. On 70 and newer there is a pivot pin pounded in the shoe and the lever is flat.

    bottom picture is a 1978 Fury 11”.

    note how the park brake lever attaches to the shoe. 1967 has a pin through the shoe with a U shaped retainer clip with the tails bent to retain it in a groove. 1978 has a rectangular hole with a tab that goes through. Yellow circle.

    D32776EF-0D1C-4827-BBCF-E902F98C925A.jpegView attachment 923481 FC5CECD2-1F19-4CA0-B0C2-97E024C1EFB8.jpeg
     
    Last edited: Mar 16, 2020
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    • Fran Blacker

      Fran Blacker FBBO Gold Member FBBO Gold Member

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      Have you put BP's shoe side and measured down through axle hole to make sure they're the same. Service manuals have pictures. Picture 11" brakes.

      rearb.JPG
       
      Last edited: Mar 16, 2020
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      • Kern Dog

        Kern Dog FBBO Gold Member FBBO Gold Member

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        Service manuals have black and white pictures of mediocre clarity!
         
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        • Fran Blacker

          Fran Blacker FBBO Gold Member FBBO Gold Member

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          Another pictures 11". rearb1.JPG Manual adjusters.
           
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          • coronet68mx

            coronet68mx FBBO Gold Member FBBO Gold Member

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            Does the front drum brakes have the same arrangement?
             
          • Kern Dog

            Kern Dog FBBO Gold Member FBBO Gold Member

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            They don't have a parking brake. Besides that, I'm not sure.
             
          • khryslerkid

            khryslerkid FBBO Gold Member FBBO Gold Member

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            These are the newer self adjuster setup. 10" x 2.5" backing plates. The only number I can see on the backing plate is a 706.
            20170809_194319.jpg
            20170809_095255.jpg Screenshot_20200316-225444.jpg 20200316_224820.jpg
             
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            • Sahara

              Sahara FBBO Gold Member FBBO Gold Member

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              I was in the same boat; a box of parts from three different rear ends.
              Got rebuild parts from Dr. Diff which came with a page of instructions. That, coupled with a YouTube video made it a piece of cake to put my brakes back together.
               
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              • Kern Dog

                Kern Dog FBBO Gold Member FBBO Gold Member

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                KhryslerKid, those brakes look amazing!
                I first wonder what the reason is for the two designs that I posted. Is one early and the other late or are they from different vendors? Does that U bracket have a purpose? I've seen some that have a stiff spring below the self adjuster and others that have a longer thin spring above it like Khrysler Kid's brakes.
                 
              • khryslerkid

                khryslerkid FBBO Gold Member FBBO Gold Member

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                Your top picture is more than likely the newer style of the two. They started putting those tabs at each end of the wheel cylinder probably to keep the cups from blowing out. That's the only reason I could come up with when I used to service them.

                They were constantly changing the design of the hardware throughout the years mainly it had to do with the adjusters.

                Full manual adjuster...
                main-qimg-dbc3f10cf994ae912a658f9db2537710-c.jpeg

                Back up and hit the brakes to adjust them...
                drumkit01-533x400-740x480.jpg

                Then the adjustment made all the time going forward and reverse.
                11 Brakes.jpg
                Same thing, just a different spring across the bottom.
                20170809_194319.jpg
                 
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                • Cornpatch MO

                  Cornpatch MO Well-Known Member

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                  The parking brake strut is confusing on the 10" drums. Some pics and aftermarket struts show they are flat. My factory service manual pictures the 10" as having a 90 degree bend along it's length , like the 11" strut. Is that for strength or for clearance? I used the flat one, and they seem to work OK , but the park brake does not work very well even with new shoes and the drums turned...................MO

                  I don't think the 10" strut shown in my SM is the correct picture. I think the one shown with the 90 degree bend , is an 11"
                   
                  Last edited: Mar 17, 2020
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                  • Kern Dog

                    Kern Dog FBBO Gold Member FBBO Gold Member

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                    I only have 3 of them and I need 10.
                     
                  • hunt2elk

                    hunt2elk FBBO Gold Member FBBO Gold Member

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                    The U shaped stiffener bracket you posted in your first pic is a piston stop. Supposedly to prevent the piston from coming out of the cylinder. It is not necessary and I don't believe they were even on the newer backing plates.
                     
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                    • Cornpatch MO

                      Cornpatch MO Well-Known Member

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                      I always thought that was to keep the rubber boot from coming off...??...............MO
                       
                    • hunt2elk

                      hunt2elk FBBO Gold Member FBBO Gold Member

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                      Now that I think about it, you are probably correct. Here is a pic from my 69 service manual showing them as piston stops. Regardless, they are not necessary.

                      20200317_125308.jpg
                       
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                      • Kern Dog

                        Kern Dog FBBO Gold Member FBBO Gold Member

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                        Uhhh...????
                        1968 Coronets had rear drum brakes but what does your post have to do with the topic here ?
                         
                      • coronet68mx

                        coronet68mx FBBO Gold Member FBBO Gold Member

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                        Damm it was met to go to this crazy german tread trying to convet a coronet into a charger :lol::rofl::screwy:
                         
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                        • coronet68mx

                          coronet68mx FBBO Gold Member FBBO Gold Member

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                          Deleted , sorry Greg.
                           
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                          • khryslerkid

                            khryslerkid FBBO Gold Member FBBO Gold Member

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