Brand new Centric drums don't fit?

Brakes for your Classic Mopar

  1. 65Val

    65Val Average Length Member

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    Anyone heard that the new Centric SBP brake drums "lock up" the rear end when tightened down? I was talking with a gent on the FB "Early Valiant and Barracuda "page. He has a problem of new Centric SBP brake drums "locking against the backing plate when tightened down" on his '65 Barracuda's 7.25 rear end. Apparently, he's tried several sets, with the same result. He says the rear end is totally stock.

    Anyone heard of this?
     
  2. mopar head

    mopar head Well-Known Member

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    China say, close enough, for you capitalist pig!:soapbox:You make work!
     
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    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

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      Too bad everybody junked their disk/ drum lathes. Would be a simple matter to turn some off the rear lip
       
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      • 65Val

        65Val Average Length Member

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        These drums worked fine on my 67 7 1/4 without any modification at all. Why would they have to be modified now?
         
      • Dana67Dart

        Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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        Are your backing plates correct for the application?

        10 x 1.75 vs 10x2
        SBP VS BBP
         
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        • SGBARRACUDA

          SGBARRACUDA ROY FABO Gold Member

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          I still have my Ammco
          i still have my Ammco 4000 drum/rotor lathe with all the tooling.
           
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          • 67Dart273

            67Dart273 FABO Gold Member FABO Gold Member

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            So do I. The disk gearbox has a problem, you must hold it in gear, but I don't use it much
             
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            • SGBARRACUDA

              SGBARRACUDA ROY FABO Gold Member

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              That would be a PITA on the slow cut.
               
            • 65Val

              65Val Average Length Member

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              I’ve asked him that… no reply yet.
               
            • Dana67Dart

              Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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              What is the part number ordered?
               
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              • 67Dart273

                67Dart273 FABO Gold Member FABO Gold Member

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                Why are you asking me? I did not manufacture either the drums nor the rear axle or any parts of
                 
              • 65Val

                65Val Average Length Member

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                Because you were the first to suggest they needed modifying, so I thought you could tell me why, when they work fine on my car.
                 
              • Dana67Dart

                Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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                Quick look couldn't find 10x1.75 rear drums anywhere.

                Anyone else?
                 
              • cudamark

                cudamark FABO Gold Member FABO Gold Member

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                You haven't stated the size of the brakes and the part number being used, but, it's possible he got front drums instead of rears. Fronts are wider and would hit the backing plate if tightened down. A simple measurement comparing the old drums to the new ones should tell the tale.
                 
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                • 65Val

                  65Val Average Length Member

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                  I’ve asked him to measure the width of his new drums…awaiting answer.

                  Not sure how to post the whole convo from FB, but here’s where it is, if you want to check it out…

                  6B7E3B72-253B-4E9C-A443-D4DD181F01F5.png
                   
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                  • RustyRatRod

                    RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                    You have the drums. You have the car and the rear end they fit on. You have everything there in front of you at your disposal to see why they don't fit correctly. It sounds like Del said, they simply need some of that inner lip trimmed back.
                     
                  • 65Val

                    65Val Average Length Member

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                    Rusty… not my car… its a guy on FB that s having the problem.., Im just trying to help him out.Read up there^^^^^^
                     
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                    • RustyRatRod

                      RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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                      Oh so you're not having the problem? Piss on it, then. LOL
                       
                    • 65Val

                      65Val Average Length Member

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                      No, but trying to help….isnt that why were here, and there?
                       
                      Last edited: Aug 6, 2021
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                      • Dana67Dart

                        Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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                        Open your kids collage fund!

                        This is for 10x1.75 SBP Rear drums 7 1/4 or 8 3/4.
                        Screenshot_20210806-171340.png


                        oem part numbers
                        2534757 - 3004743 - 3580551 Screenshot_20210806-170959.png
                         
                      • furyus2

                        furyus2 Well-Known Member

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                        I had this same problem on my Dart. Its not the backing plates. It's china junk. I had a machinist buddy cut 1/4 inch off the edge, and the little flange on the drum needs cutting back also. Check your measurements though. It's been a while since I did this.
                         
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                        • furyus2

                          furyus2 Well-Known Member

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                          I would also have a clean up cut done on the drums braking surface. Mine were making all kinds of racket, until I had them turned.
                           
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                          • 65Val

                            65Val Average Length Member

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                            Funny thing… they went right on my 7.25, and later 8.75 in my Dart with no mods at all.
                             
                          • furyus2

                            furyus2 Well-Known Member

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                            Well, who knows what the chinese are thinking when they make their junk.
                             
                          • 65Val

                            65Val Average Length Member

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                            I’m just happy they’re available for SBP. Seems “the big guys” have abandoned us A body peeps.
                             
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