8 & 3/4 rear brake conversion to disc info

Brakes for your Classic Mopar

  1. dmflash24

    dmflash24 Member

    Messages:
    10
    Likes Received:
    1
    Joined:
    Jun 14, 2015
    Location:
    Speedway,Indiana
    Local Time:
    9:17 PM
    I need some help on buying a conversion brake system. I bought a Yukon bearing kit for the rear axle but Now I've decided to convert the rear brakes to disc. I see that they say you have to use green bearing. I need to know if the Yukon bearings will work. I don't know the difference.And the old bearings had a adjuster on one end do you still use that. I was looking at the wilwood or The summit brake conversion. Can I get some help here ? Thanks, Derek
     
  2. my68barracuda

    my68barracuda Well-Known Member

    Messages:
    1,243
    Likes Received:
    932
    Joined:
    Dec 6, 2009
    Location:
    Indianapolis IN
    Local Time:
    10:17 PM
    Dr Diff has a couple of rear disk brake conversion kits, put his stuff on the list of potentials.
    I put one of his disk brake kits on a 8.75 using his axels with green bearings, went on simple and easy.
    Cass is super on customer service and support before and after the sale. Tell him you have Yukon bearings and he will lay out your options.
     
    • Agree Agree x 6
    • dano

      dano Evil Handy Man

      Messages:
      3,009
      Likes Received:
      938
      Joined:
      Aug 22, 2005
      Location:
      Gresham, Oregon
      Local Time:
      7:17 PM
      Best advice ever! Cass is great. Shoot him an email with any questions. He even backs his products with tech support.
       
      • Agree Agree x 2
      • Like Like x 1
      • dodgedifferent2

        dodgedifferent2 Well-Known Member

        Messages:
        2,517
        Likes Received:
        343
        Joined:
        Aug 8, 2008
        Location:
        southwestern, Ontario
        Local Time:
        9:17 PM
        I do brackets for the stock bearing setup and I also believe they work for green bearings
        I use the mustang calipers and rotors
         
        • Like Like x 1
        • DrEamer

          DrEamer I suffer from cars on the brain!

          Messages:
          369
          Likes Received:
          509
          Joined:
          Mar 9, 2019
          Location:
          Oregon
          Local Time:
          7:17 PM
          Who made the bracket kit for the Mustang calipers if you do not mind me asking?
           
        • dodge71demon

          dodge71demon Well-Known Member

          Messages:
          3,340
          Likes Received:
          504
          Joined:
          Apr 29, 2009
          Location:
          Indiana
          Local Time:
          10:17 PM
          don't do it I prefer drums in the rear but I'm old
           
        • dodgedifferent2

          dodgedifferent2 Well-Known Member

          Messages:
          2,517
          Likes Received:
          343
          Joined:
          Aug 8, 2008
          Location:
          southwestern, Ontario
          Local Time:
          9:17 PM
          Myself.
          Rear disc Brakes on 8 3/4

          20190913_154925.jpg
           
          • Like Like x 1
          • 65 Dartman

            65 Dartman FABO Gold Member FABO Gold Member

            Messages:
            11,247
            Likes Received:
            2903
            Joined:
            Sep 24, 2006
            Location:
            Strasburg, VA
            Local Time:
            10:17 PM
            I have his brackets and sourced the rotors and calipers locally and the hoses from Summit per his recommendation. Everything went together on the 8.75 like it was made for it (which it was)! For axles I’m using shortened and resplined 71-74 truck axles by Moser with stock tapered bearings and adjuster. The rear end not yet installed as still lots of work to be done on my wagon - sedan delivery conversion.

            4FB67B90-1BB9-4FB4-B533-77E933C8667D.jpeg
             
          • 1968Dart

            1968Dart My 63 Dart 2 door Sedan

            Messages:
            81
            Likes Received:
            7
            Joined:
            Jun 9, 2009
            Location:
            Ontario, Canada
            Local Time:
            8:17 PM
          • dodgedifferent2

            dodgedifferent2 Well-Known Member

            Messages:
            2,517
            Likes Received:
            343
            Joined:
            Aug 8, 2008
            Location:
            southwestern, Ontario
            Local Time:
            9:17 PM
            No I have never made any for the bigger rotors
             
          • 1968Dart

            1968Dart My 63 Dart 2 door Sedan

            Messages:
            81
            Likes Received:
            7
            Joined:
            Jun 9, 2009
            Location:
            Ontario, Canada
            Local Time:
            8:17 PM
            Would you be doing a kit in the near future?
             
          • dodgedifferent2

            dodgedifferent2 Well-Known Member

            Messages:
            2,517
            Likes Received:
            343
            Joined:
            Aug 8, 2008
            Location:
            southwestern, Ontario
            Local Time:
            9:17 PM
            Not likely as the expense for rotors and calipers that I never plan to use on my car does not offset the costs for potentially one setup
             
          • 65 Dartman

            65 Dartman FABO Gold Member FABO Gold Member

            Messages:
            11,247
            Likes Received:
            2903
            Joined:
            Sep 24, 2006
            Location:
            Strasburg, VA
            Local Time:
            10:17 PM
            I’m not sure if he was referring to a kit for the larger rotors or the standard kit you are/were making. I may be in the market for another regular kit from you as I really like the setup and ease of installation over the TSR kit that uses Lincoln rotors and Caddie calipers.
             
          • dodgedifferent2

            dodgedifferent2 Well-Known Member

            Messages:
            2,517
            Likes Received:
            343
            Joined:
            Aug 8, 2008
            Location:
            southwestern, Ontario
            Local Time:
            9:17 PM
            I believe he was referring to the bigger rotors.
             
            • Agree Agree x 1
            • 1968Dart

              1968Dart My 63 Dart 2 door Sedan

              Messages:
              81
              Likes Received:
              7
              Joined:
              Jun 9, 2009
              Location:
              Ontario, Canada
              Local Time:
              8:17 PM
              Yes, I was referring to the larger diameter, also possibly a vented rotor as well.
              Great kit that I got off you though.
               
            • siuauto

              siuauto Well-Known Member

              Messages:
              333
              Likes Received:
              45
              Joined:
              Jan 9, 2008
              Location:
              Joliet Illinois
              Local Time:
              9:17 PM
            • dodgedifferent2

              dodgedifferent2 Well-Known Member

              Messages:
              2,517
              Likes Received:
              343
              Joined:
              Aug 8, 2008
              Location:
              southwestern, Ontario
              Local Time:
              9:17 PM
              Yes I believe I have 4 sets tyat I need to complete the finishing steps
               
            • siuauto

              siuauto Well-Known Member

              Messages:
              333
              Likes Received:
              45
              Joined:
              Jan 9, 2008
              Location:
              Joliet Illinois
              Local Time:
              9:17 PM
              I would love a set once you are ready. How much is a set?
               
            • 71Twister440

              71Twister440 Well-Known Member

              Messages:
              65
              Likes Received:
              16
              Joined:
              Dec 6, 2017
              Location:
              Lagrangeville
              Local Time:
              10:17 PM
              Id also be interested, you said rotors have to be milled down for axles? or stock rotors work? any special prop valve needed? have 73 and up style on the front and drums out back but id like to ditch the drums and go 4 wheel disc....
               
            • TALK ABOUT IT

              TALK ABOUT IT Well-Known Member

              Messages:
              52
              Likes Received:
              17
              Joined:
              Feb 27, 2020
              Location:
              new york
              Local Time:
              10:17 PM
              Hey 71T440. You can swap to rear disc brakes from a 2002 to 2007 Jeep Liberty. Or 93 to 98 Jeep Grand Cherokee. An a Jeep Wrangler 2003 to 2006. See the story me (TALK ABOUT IT) an one of the writers at Mopar action did back on AUG, OCT, 2018 issue. One modification must be done to the caliper brackets after that its 100% bolt-on. Its all from mother Mopar. No ford GM anything. Take everything off a Jeep in the salvage yard an have a machine shop grind down the brackets to 0.100". pg-66 photo #7. If you like u can pick-up drilled an slotted rotors. An red powder coated calipers from amazon.
               
              Last edited: May 13, 2020
            • TALK ABOUT IT

              TALK ABOUT IT Well-Known Member

              Messages:
              52
              Likes Received:
              17
              Joined:
              Feb 27, 2020
              Location:
              new york
              Local Time:
              10:17 PM
              This is a rear disc brake set-up i put on my 1980 Ply Volar'e station wagon. It's a 8.75 rear from a 1970 B-Body. The calipers, pads and rotor are from a 03-07 Liberty. The caliper bracket is from a 1995 Grand Cherokee. The bracket must be modified to work on all 8.75 rears. The brackets are all the same on the Liberty, Grand Cherokee and the Wrangler. Liberty rotors, calipers and pads are much beefier. Any rear disc brake set-up is way better than drums from the 60's an 70's... 50 plus yrs ago. 58564.jpg
               
            • dodgedifferent2

              dodgedifferent2 Well-Known Member

              Messages:
              2,517
              Likes Received:
              343
              Joined:
              Aug 8, 2008
              Location:
              southwestern, Ontario
              Local Time:
              9:17 PM
              The center register in the rotor needs to be opened up .04 of an inch to clear the axle register. Basically a stock mustang rotor.
              You can use a prop valve if you want, but since you have disc on the front already than your master cylinder will still work because the proportion is already built in. The front brakes do all the work. The rear just helps finish it off, the master cylinder does not know if its drum or disc in the rear. It just supplies the same amount of fluid.

              I originally ran a manual 15/16 bore master cylinder from a 90s dakota.
              Now I am running a hydroboost system from a 05 ish diesel ram with 1 1/8 bore master from a 92 ram van.

              The problem with mopar rear disc is the parking brake shoes. I detest those and have only ever had issues with them on my dakotas, rams, sebrings, intrepid and the charger. I always get them seizing and locking up the brakes. Besides that style of brake was not designed by mopar anyways. It's a system prepared for them by another company and bolted on.
               
            1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
              By continuing to use this site, you are consenting to our use of cookies.