Disc Brake Conversion

Brakes for your Classic Mopar

  1. Peedeeguard

    Peedeeguard Active Member

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    I am going to swap out my drum brakes for disc on my 68 Barracuda. I was looking at Right Stuff's Conversion Kit or Speedway's Conversion Kit. Has anyone ever used either of these kits?
    I need the 5 × 4.5 bolt pattern.
     
    Last edited: Aug 15, 2019
  2. Heywodja

    Heywodja The Heartbeat Stops Here. FABO Gold Member

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    One other option is Doctordiff.com live person to chat with too!
     
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    • 72bluNblu

      72bluNblu FABO Gold Member FABO Gold Member

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      The speedway kit is “new” so you’re unlikely to find someone that’s used it.

      That said, it looks exactly like a 73+ disk conversion. My guess would be that it’s an MBM or PirateJack kit. The only thing I don’t see is the tapered ball joint spacers. I wonder if they they had the 73+ spindles machined with the smaller ball joint taper? The description kind of implies something like that.

      Really though if that’s the case you’re just doing a 73+ disk swap and paying for a non-stock looking brake booster you don’t need. Same for the adjustable prop valve. You can get a 73+ conversion from Dr.Diff for less than the speedway kit.

      I’ve never been a fan of the SSBC set up. There’s no big advantage over the 73+ kit and you’re stuck buying their parts forever. At least with the 73+ Mopar swap you’re just using factory parts you can get anywhere. The SSBC kit has always struck me as OE type parts, but not Mopar parts. If you’re going to go aftermarket you might as well get better stuff to justify the hassle of buying all your parts from one company.
       
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      • Dana67Dart

        Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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        IMHO, if you do a stock replacement you will always be able to get the right replacement parts
         
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        • jrcr_15

          jrcr_15 Well-Known Member

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          Not to hyjack this thread, but are the stock 73+ front brake set ups indeed comparable in perfomance to many of the aftermarket set ups like mbm etc?
           
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          • harrisonm

            harrisonm Well-Known Member

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            I used the Stainless Steel Brake Corp kit (I assume you are talking fronts) about 10 years ago. Best upgrade ever. Excellent quality, and easy install.
             
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            • 72bluNblu

              72bluNblu FABO Gold Member FABO Gold Member

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              MBM is literally just a stock 73+ brake set up, they are just reproduction factory parts with a couple of minor modifications.

              All MBM/PirateJack does for their SBP kit is drill a 5x4” bolt pattern on blank 73+ rotors and turn down the hub register a little bit so they fit a couple more of the early style rims. Other than that, the MBM kit is just a reproduction 73+ Mopar disk brake set up. And they include the tapered ball joint adapters.

              Their BBP kit is just a 73+ disk set up. They add the tapered ball joint adapters for cars that were originally SBP so the UCA’s don’t have to be changed. That’s it. Well, that and the cheap wheel bearings and components. DoctorDiff will sell you a 73+ brake kit and you get real Timken bearings, quality seals and actual customer service.
               
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              • Peedeeguard

                Peedeeguard Active Member

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                Thank you for the help. This is the first time I have attempted anything like this so I really feel like a virgin. So you are saying that I do not need the brake booster?
                 
              • Peedeeguard

                Peedeeguard Active Member

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                Thank you. I will look into their kit.
                 
              • Peedeeguard

                Peedeeguard Active Member

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                Thank you. I will look into their kits.
                 
              • Peedeeguard

                Peedeeguard Active Member

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                Please excuse this virgin question but, how can I tell if a kit is stock or not?
                Thanks
                 
              • jrcr_15

                jrcr_15 Well-Known Member

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                Are 73+ rotors the same size as the the 72 and earlier?
                 
              • halifaxhops

                halifaxhops It's going to get stupid around here! FABO Gold Member

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                Dr Diff is the guy for this! @mobileparts might have it all also.
                 
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                • KosmicKuda

                  KosmicKuda FABO Gold Member FABO Gold Member

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                  You do not need power brakes unless you have a physical limitation. Unnecessary weight and loss of engine accessibility are drawbacks,. Simple is good.
                  Use a 73-75 A-body power brake MC but run it manually.
                   
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                  • Peedeeguard

                    Peedeeguard Active Member

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                    Thanks. I agree, simple is good.
                     
                  • toolmanmike

                    toolmanmike FABO Staff Staff Member FABO Gold Member

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                    Some have used the Scarebird adapters and kits. Use their brackets and over the counter pieces to complete the conversion.
                     
                  • Dana67Dart

                    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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                    What I was trying to say is if you buy the OEM parts needed for the conversion, Upper control arm, spindle, hub, rotor, caliper, lower control arm (not sure if you need that), hoses, and pads from an appropriate year to get you 5x4.5 BBP and discs, then you will only have to remember that your front end parts are for a (I'm just pulling this date and car out of my butt cause I don't recall the change over date to 5x 4.5 BBP) 1975 dart, duster etc
                     
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                    • Peedeeguard

                      Peedeeguard Active Member

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                      So if I buy everything that I need for the conversion by ordering the parts for a 75 Duster, those parts will fit on my 68 Barracuda? Thank you for the advice. I really do appreciate it.
                       
                    • 72bluNblu

                      72bluNblu FABO Gold Member FABO Gold Member

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                      I don’t think a brake booster is necessary. I myself prefer manual disks on these cars. I use a 15/16” bore master cylinder, which gives a little longer pedal throw but also lessens the force needed to push the pedal then stock manual brakes.

                      I just find the pedal feel with the booster to be kinda vague, the pedal feel and brake control is better with a 15/16” manual master cylinder. At least in my opinion.
                      The rotor diameter is the same. The whole hub and rotor set up is different though.
                       
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                      • G-Fish

                        G-Fish Member

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                        I contacted forum member James from P-S-T. when I went manual 4-wheel disc on my '67 Barracuda. Got a forum member discount and all the tech help I needed. Very pleased.
                         
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                        • Dana67Dart

                          Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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