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Technical Converting a model A to Juice brakes

Discussion in 'Traditional Hot Rods' started by Dave Huelke, Sep 15, 2021.

  1. Dave Huelke
    Joined: Feb 22, 2016
    Posts: 46

    Dave Huelke

    Hi guys wanted to know when suing stock axles and 40 backing plates to convert a model A to Juice brakes can I use model A brake drums or do I need to use 40 Drums? if I need to use 40 drums will I need to do anything to the bearings?
     
    dirt t likes this.
  2. continentaljohn
    Joined: Jul 24, 2002
    Posts: 5,538

    continentaljohn
    Member

    Can’t use model a brake drums and model a ford have drum and hub as one. So you will need drums hub and backing plates
     
    Nailhead A-V8 likes this.
  3. Hot Rod Nut
    Joined: Jul 1, 2006
    Posts: 571

    Hot Rod Nut

    I'm all most sure you have to use 40 druns. and the 40 drum bearings work, once you use a Kit to adapt them to the spindles. Speedway use to sell the Kit, it has 2 big rings to put the backing plate on the spindle and 2 small rings to help the rear bearing fit on the spindle. Make since? Hope this help.
     
    ChupaJustin and Nailhead A-V8 like this.
  4. 31Apickup
    Joined: Nov 8, 2005
    Posts: 3,379

    31Apickup
    Member

    Besides Model A drums are smaller diameter.
     

  5. Dave Huelke
    Joined: Feb 22, 2016
    Posts: 46

    Dave Huelke

    Does this hold true for both front and rear axles?
     
  6. Nailhead A-V8
    Joined: Jun 11, 2012
    Posts: 1,348

    Nailhead A-V8
    Member

    @RICH B ? Isn't there some interference between B/P & drum until you use a custom bearing race or cone spacer to move the drum out? or I've even seen a thread on here where a guy machined the drums backing pates and shoes because the spacer is hard on axle keys apparently
     
    Last edited: Sep 15, 2021
  7. Nailhead A-V8
    Joined: Jun 11, 2012
    Posts: 1,348

    Nailhead A-V8
    Member

    Yes... if you have a set of model A piston rings...they are the exact size needed to space between B/P and spindle
     
  8. Nailhead A-V8
    Joined: Jun 11, 2012
    Posts: 1,348

    Nailhead A-V8
    Member

    Oh and you first have have to decide whether you will heat and dimple your b/p's or cut a hole in them... and also if you will clock them so the spring doesn't interfere with the w/c or flip them so the w/c is on the bottom or have the axle ends machined to move the brakes inboard ...man there's quite a bit of conflicting info and seemingly arduous routes out there:confused: but the fact is guys have been doing it forever
     
    gimpyshotrods likes this.
  9. What are your plans for a master cylinder mount? They make a battery box that also incorporates a master cylinder mount but be careful some manufacturers use metal that is too thin and they flex. Where, in general, are you located?

    Charlie Stephens
     
  10. Dave Huelke
    Joined: Feb 22, 2016
    Posts: 46

    Dave Huelke

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