Using mustang rotors for 4.5" bc

Brakes for your Classic Mopar

  1. I8NEMO

    I8NEMO FABO Gold Member FABO Gold Member

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    I thought the same, and actually had them drilled for 4.5 BP just for mocking up wheels. If memory serves, the problem lies in the boss undulations on the back surface.
     
  2. needsaresto

    needsaresto Well-Known Member

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    I'm suprised nobody has simply manufactured a mopar kh rotor with the bbp.
     
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    • clementine

      clementine Flight risk FABO Gold Member

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      I as well did not read all 11 pages. but I do have a set of stock discs that have been massaged to be 4.5" bolt pattern. My first look through the shop has produced zero results. A clean will be necessary, but Ill keep looking if this is pertinent to the conversation.
       
    • needsaresto

      needsaresto Well-Known Member

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      I'd be very interested. I'm planning on using KH brakes on my 1970 Dart, have everything from spindles, calipers,pads brackets, and rotors.Upgrading the diff to a D60 with BBP axles so it makes sense to find a method to change the front discs to BBP as well. These rotors are in great shape and I'd love to re use them.
       
    • Kendog 170

      Kendog 170 Let the boy go !

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      I have KH on my ragtop so I have the original BP. If I was you I would sell the KH set up and buy the (73 -76?) dart disc brakes. You would probably break even or even make some money if you sold the KH parts individually Hubs are harder to come by as well as Calipers JMO
       
    • Kendog 170

      Kendog 170 Let the boy go !

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    • clementine

      clementine Flight risk FABO Gold Member

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      Ill look a little harder for them. Sun i will be there. They might be buried under Heidis mach. I local old timer hot rod friend sold em to me. He is putting together a 340 fastback and actually went back to drums. Great guy. One of those people that everyone should have.
       
    • I8NEMO

      I8NEMO FABO Gold Member FABO Gold Member

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      I too wanted to keep my factory kh front disc set up but it was the Year One Rallye wheels and tire choice I made, and the stance changes I planned, that made bbp mandatory. I did have the factory rotors drilled for 5x4.5, but only for mocking up wheels, one look at the 2 pc. design and you'll see why re- drilling is not a safe/viable option. Then of course this spiraled into 2" drop spindle, tubular LCA, UCA, Hotchkiss Sway...

      20220509_132539.jpg

      20191010_095712.jpg

      12 inch Year One Rallye.jpg
       
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      • needsaresto

        needsaresto Well-Known Member

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        If I could find a bbp setup locally then I'd probably do it. Shipping into Canada will kill any good deals from the US. Places like Pirate Jacks etc would be even more. I do want to stick with a factory brake system. Aftermarket stuff is even more money, not worth it imo.
         
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        • clementine

          clementine Flight risk FABO Gold Member

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          I haven't forgot. Been busier than a one legged man in an ass kicking contest.
           
        • needsaresto

          needsaresto Well-Known Member

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          I understand. Thanks for the update!
           
        • Dave999

          Dave999 Well-Known Member

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          anyone looked at austrlian rotors
          post 71 they were 4.5 inch PCD for 68 69 and half of 1970 they were 4 inch
          designed to work with 1 piston Kelsey hayse pinand bush bracket sliders or Girling Girlcok "floating" bracket sliders much like the post 73 US calipers
          (you can't mix n match calipers and brackets across continets ive tried.)

          these fit a mopar hub with 4.5inch stud PCD
          what i can't tell you is if the Austrlian Hub and its bearings and seals fit a US stub axle.

          and if usuing a fixed rather than floating caliper ask about rotor offset
          or check bendix aussie website for catalogue with dimensions


          aussie cars were almost universally shod with 14 inch steel wheels unless it was a Pacer or an R/T in which case alloys, with even less caliper space

          they do 9 and 10 inch drums as well 4.5 inch PCD post 71, 4 inch pre 71
          handy for converted early 6 cylinder A body i would guess.

          i haven't tired any of it this is based on having an aussie car...

          (rotors, drums) vh valiant: Search Result | eBay


          EBC bendix DBA etc i'm sure you must have agents for them in the US
          in which case an order and a LONG wait might get you what you need without resorting to milling and turning.....
          if you like ford stuff aussie Ford falcon rotor might get you closer...

          VALIANT

          Search results for: 'rotors' | Hemi Performance
           
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