Help newbieDisk brake conversion directions

Brakes for your Classic Mopar

  1. mkingan

    mkingan Well-Known Member

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    Hi, new to forum and got my first a-body. My brother had this car for 10 years and I've always wanted it so I finally got it. its a 65 valiant/barracuda convertible clone. I have a couple of questions to swap out the drum to disk brake conversion. he kept the car pretty original so non-power drum brakes up front. he was in the process of acquiring the parts to do the swap due to him not having the leg strength to push the non-powered brakes. Anyway, I have the spindles, backing plates and caliper brackets I want to retain the 14" wheels he has on it. He also acquired two power boosters. I'm not sure what size rotors or caliper types I need and the master cylinder setup that would fit. it has the 273 commando in it. I have also read that the bottom control arm needs to be replaced to accommodate the new spindles? any help or direction on this would be much appreciated
     
  2. furyus2

    furyus2 FABO Gold Member FABO Gold Member

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    I don't know the answer to your question , but welcome.
     
  3. 65 Dartman

    65 Dartman FABO Gold Member FABO Gold Member

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    It would help to know from which year/donor are the parts from - 65-72 or 73-76. Both disc set-up will take the 14 in wheels.

    Welcome to FABO!
     
  4. mkingan

    mkingan Well-Known Member

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    ill take some pics tonight and see if I can get the answers from what year he got the spindles from
     
  5. RedFish

    RedFish Well-Known Member

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    I don't know of a disc brake conversion that will require lower arms be changed. Lower ball joint will need to be changed to match whatever spindles you have.
     
  6. Dubob

    Dubob Well-Known Member

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  7. mkingan

    mkingan Well-Known Member

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    thanks for all the input. I read that article and seems the spindles are correct. not real sure on the caliper bracket though for the 14" wheels and I'm pretty sure I need the smaller rotors.
     

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  8. BlueDream

    BlueDream Aspiring Mopar enthusiast

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    I can't help with the brake questions, but welcome to FABO! And hello from Fayetteville :glasses7:
     
  9. BillGrissom

    BillGrissom Well-Known Member

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    You have the 1973+ factory disks. There are many articles detailing the swap. You will need to change only the upper control arm or not even that if you buy the tapered sleeve to use your current upper ball joint. Choice depends on what other suspension work needs doing.

    The MC is really a separate issue. You need more hydraulic pressure to operate front disks, which is why most cars today have boosters. But, many here are happy w/ manual disks with a small-bore MC - 7/8"D or 15/16" D.
     
  10. rich006

    rich006 Learning as I go

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  11. ir3333

    ir3333 Well-Known Member

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    just a thought....Mopar power discs are very sensitive and it is near impossible to not lock them in a panic stop.With the 1 " or 15/16" master and the later 2 3/4" callipers manual brakes operate very easy with very little leg pressure.
    ..and you get rid of engine bay clutter
     
  12. mkingan

    mkingan Well-Known Member

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    ok great info! I'm reading that the upper control arm needs replaced? why?
     
  13. memike

    memike Super Moderator Staff Member FABO Gold Member

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    I picked up what I needed from The Ram Man and it is the same as you have there, if you don't want to change out the upper A arm look him up for any parts you need
    Do a youtube search on Ram Man Mopar brakes and you can learn allot from him.

    Love mine, any part you need just give him a call, he leaves his phone number on his utube video's :color: Tell him you herd it from me here :glasses7:
     

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  14. Mopar Tim

    Mopar Tim FABO Gold Member FABO Gold Member

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    Because those spindles use a different size upper ball joint. It has a bigger tapered hole. you can use a tapered bushing if everything else is good and not needing to be rebuilt.
     
  15. memike

    memike Super Moderator Staff Member FABO Gold Member

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    That is what I did and used the tapered bushing :coffee2:
     
  16. Mopar Tim

    Mopar Tim FABO Gold Member FABO Gold Member

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    Guy who thought that bushing up was a smart guy indeed
     
  17. mkingan

    mkingan Well-Known Member

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    yea everything is new. so I can get the bushing from the ram man?
     
  18. Mopar Tim

    Mopar Tim FABO Gold Member FABO Gold Member

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  19. Bob52

    Bob52 Member

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    I am putting a Wilwood disk conversion kit on my 64 Barracuda. They said it would work with 14” rims but my old steel rims do not fit. The center bore is too small on them to fit over the hub and the rim offset lets the welded tab inside the rim hit the caliper; so now I have to get larger rims. You should check to see if you have the same problem with your setup. Good luck
     
  20. Mopar Tim

    Mopar Tim FABO Gold Member FABO Gold Member

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    What
    Wilwood kit you using?
     
  21. InItSwingIt

    InItSwingIt Well-Known Member

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    Good info, that tapered bushing is going to save me some beer money! Whoooo!
     
  22. BillGrissom

    BillGrissom Well-Known Member

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    If you do decide to change the UCA, for bling consider tubular UCA's. Also functional because they allow adjusting for more caster, which you need with radial tires. After all the cost and effort of de-rusting & painting a 1973+ UCA w/ new bushings and ball joint, the cost seems reasonable.
     
  23. mkingan

    mkingan Well-Known Member

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    thats the issue i have the steel wheels won't fit over the hub too small. i need to get my hands on a big bolt pattern wheel so i can see if its going to work
     
  24. mkingan

    mkingan Well-Known Member

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    if anyone has 14" big bolt pattern in arkansas can you pm me? lost number thanks
     
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