A Body Disc Brake Swap 101

Brakes for your Classic Mopar

Did this thread help you out?

  1. Yes

    235 vote(s)
    94.4%
  2. No

    14 vote(s)
    5.6%
  1. JLP

    JLP Well-Known Member

    Messages:
    407
    Likes Received:
    2
    Joined:
    Apr 25, 2005
    Location:
    Oregon
    Local Time:
    1:31 AM
    Buy a good set set of flare/line wrenches (Mac, Snap-on etc.) the cheap sets have to much flex and still round the fittings off.
     
  2. Oldmanmopar

    Oldmanmopar Going left turning right FABO Gold Member

    Messages:
    7,766
    Likes Received:
    3581
    Joined:
    Jan 8, 2009
    Location:
    Danielsville Pa.
    Local Time:
    4:31 AM
    I got to this post on this thread and I stopped. This car will never steer with the calipers on the front with a 72 and older stabilizer bar. The caliper will hit the bar. When ever you do one of these swaps rule of thum is 72 and older calipers go to the rear with the use of a Volari Aspen Brake hoses. Good luck guys looks like you all are having another fun day. I vote no help at all. Steve
     
  3. Muad'Dib15

    Muad'Dib15 Silly Basterd

    Messages:
    1,037
    Likes Received:
    17
    Joined:
    May 31, 2010
    Location:
    WI
    Local Time:
    3:31 AM
    NO, they can't. You can drill them out if you are feeling adventurist, but it's not a good idea as there is not much material left on them to hold the bolts. Did it today on my 66. luckily Carquest had a set of lower ball joints for a 74 scamp in stock and I was able to get them on and works fine.

    yes you can actually if you use the bbp large spindles. same story as above, just put the scamp lower ball joint on and it went right in.

    yep, true. You also can't use the stock brake hoses as they aren't long enough.

    There are a couple misconceptions that must be cleared up.

    First, the lower ball joints unless you don't mind drilling them out will NOT fit the larger spindles if you are going from 9 in drum brakes. You have to get the lbj from the 73 and up cars. Also, the dust seals that you get will not fit. you can try but if they are anything like mine were, the seals fit fine on the spindle but wobbled around inside the caliper and would have allowed dust to get in there eventually. the part number for the seals that you'll get from an auto parts store is 6815. What you need is the seal part number CR (chicago Rawhide) 19226. It doesn't look like the original seal, but fits right on the spindle and tight in the rotor. Other than that, this thread helped a lot. Belated thanks Bruce.
     
  4. dgc333

    dgc333 Well-Known Member

    Messages:
    4,125
    Likes Received:
    17
    Joined:
    Jan 12, 2005
    Location:
    Pembroke, MA
    Local Time:
    4:31 AM
    The dust seals I used when I did the swap were Timken brand and were identical to the ones that were in the old rotors and fit the new rotors and the doner spindles fine.
     
  5. Oklacarcollecto

    Oklacarcollecto Life is an experiment

    Messages:
    17,292
    Likes Received:
    285
    Joined:
    Mar 13, 2009
    Location:
    North Central Oklahoma
    Local Time:
    3:31 AM
    I copied this post and added it here so it will be easily found when others ask the same information.

     
  6. Snake

    Snake Mopar Nut

    Messages:
    9,273
    Likes Received:
    263
    Joined:
    May 22, 2006
    Location:
    Belleville Canada
    Local Time:
    3:31 AM
    Ya know I re read this over again and it had me starting to cry,loosing a great teacher and member,sometimes this world sucks,thanks Bruce,we still think of ya.:burnout:
     
  7. kbsouers

    kbsouers Well-Known Member

    Messages:
    206
    Likes Received:
    13
    Joined:
    Dec 4, 2012
    Location:
    Fishkill, New York
    Local Time:
    4:31 AM
    :blob:Just finnished my swap. I got the UCA and Spindals from Steves Musslecar parts.He is a FABO member. They came off a 73 dart I left the calipers up front, my feeling is better cooling and less road dirt slinging on to them. I did replace all front end parts. a little sandblasting and some paint and waalaa!... but Ive had this car apart for 15 years so It wasnt that easy I put this togeather 4 times befor I had it right... good thread...
     

    Attached Files:

  8. PanGasket

    PanGasket has cork sides

    Messages:
    4,618
    Likes Received:
    65
    Joined:
    Mar 16, 2010
    Location:
    Gainesville, GA
    Local Time:
    4:31 AM
    every time this thread pops up...

    I miss you Bruce. Somewhere in heaven, you are beating Hemi Cudas in your GT.
     
  9. RedFish

    RedFish Well-Known Member

    Messages:
    23,757
    Likes Received:
    2473
    Joined:
    Sep 5, 2007
    Local Time:
    4:31 AM
    Why does that not look right to me ? Wasn't the sway bars end link on the top ? Isn't this the reason the calipers had to be moved to the rear ?
    I suppose it doesn't make much difference if it works.
     
  10. 604B1duster

    604B1duster Well-Known Member

    Messages:
    1,194
    Likes Received:
    423
    Joined:
    Dec 30, 2007
    Local Time:
    3:31 AM
    Nice job, looks great
     
  11. charlie

    charlie New Member

    Messages:
    2
    Likes Received:
    0
    Joined:
    Jul 23, 2012
    Location:
    elgin
    Local Time:
    3:31 AM
    do you know if this will fit a 1971 plymouth valiant?
     
  12. 41husk

    41husk Well-Known Member

    Messages:
    914
    Likes Received:
    19
    Joined:
    Oct 4, 2011
    Location:
    Southern Illinois
    Local Time:
    3:31 AM
    Very helpful, thanks. I think I will be trying this in the near future and I am sure I will be referring back.
     
  13. Oklacarcollecto

    Oklacarcollecto Life is an experiment

    Messages:
    17,292
    Likes Received:
    285
    Joined:
    Mar 13, 2009
    Location:
    North Central Oklahoma
    Local Time:
    3:31 AM

    Attached Files:

  14. PanGasket

    PanGasket has cork sides

    Messages:
    4,618
    Likes Received:
    65
    Joined:
    Mar 16, 2010
    Location:
    Gainesville, GA
    Local Time:
    4:31 AM
  15. 2 Darts

    2 Darts A-body Addicted

    Messages:
    3,473
    Likes Received:
    206
    Joined:
    Mar 28, 2008
    Location:
    In a house
    Local Time:
    3:31 AM
    Was rummaging through photos and ran across a photo of what to get from search salvage yards for BBP disk brakes.

    Not shown: Master cylinder & proportioning valve
     

    Attached Files:

    • Thanks! Thanks! x 1
    • RustyRatRod

      RustyRatRod Weenie idiot loser. FABO Gold Member

      Messages:
      57,895
      Likes Received:
      27898
      Joined:
      Jun 7, 2010
      Location:
      Georgia
      Local Time:
      4:31 AM
      Bruce (RIP) would be very happy to see his thread still goin strong.
       
    • herekdkd

      herekdkd Active Member

      Messages:
      34
      Likes Received:
      0
      Joined:
      Jan 17, 2014
      Location:
      Albuquerque
      Local Time:
      2:31 AM
      So I'm a little confused and I apologize in advance for my lack of experience on this subject. I completely understand the various ways to convert drum-to-disc,parts that will work and won't work, etc, but what if someone is converting SBP drum to LBP disc in the front...what happens with the rear drums? I haven't read anything regarding the swap from SBP to LBP out back.???....or have I totally missed something!! :dontknow:
       
    • RedFish

      RedFish Well-Known Member

      Messages:
      23,757
      Likes Received:
      2473
      Joined:
      Sep 5, 2007
      Local Time:
      4:31 AM
      Drum brakes are what they are. The bolt pattern difference from front to rear that is created here isn't addressed in this thread because its a totally different issue.
      There is a wide variety of solutions. Some run adapters. Some change the entire rear axle assembly.
       
    • sleepyhead416

      sleepyhead416 Well-Known Member

      Messages:
      701
      Likes Received:
      14
      Joined:
      Apr 20, 2010
      Location:
      Mcdonald pa
      Local Time:
      3:31 AM
      When making sway do you have to use offset control arm bushings ????
       
    • dvav

      dvav Well-Known Member

      Messages:
      131
      Likes Received:
      5
      Joined:
      Dec 24, 2012
      Location:
      salmo
      Local Time:
      1:31 AM
      so if you had factory discs sbp would you bother to upgrade or stick with them .also does any one know if you can just change the rotor to get bbp .
       
    • RedFish

      RedFish Well-Known Member

      Messages:
      23,757
      Likes Received:
      2473
      Joined:
      Sep 5, 2007
      Local Time:
      4:31 AM
      I personally don't like fixed multi piston calipers but... If I owned them I wouldn't spend to replace them. Very similar brakes were used on early Mustangs which did have the 5 on 4.5 bolt pattern. There are differences in bearings, etc.. to address. It has been done though.
       
    • Treblig

      Treblig Well-Known Member

      Messages:
      5,785
      Likes Received:
      2976
      Joined:
      Oct 5, 2013
      Location:
      South Texas
      Local Time:
      3:31 AM

      I solved the problem by getting a dual bolt pattern spare rim!!! I used '73 charger front disc brakes and believe me I could disconnect the rear drums and still stop on a dime. In all honesty, I installed Chevy 10 bolt rear because the larger a-body Mopar rear ends are very hard to get around here and when you do find one it cost a small fortune. So don't beat me up for using a good HD rear end I had laying around in my garage. After installing the BBP discs up front and the Chevy rear I bought a dual bolt pattern steel rim for a spare 5 X 4 1/2 by 5 X 4 3/4. It works great and I can stop like sports car.

      treblig
       
    • mopar jimmie

      mopar jimmie Mopar Jimmie

      Messages:
      395
      Likes Received:
      26
      Joined:
      Jul 22, 2013
      Location:
      nj
      Local Time:
      4:31 AM
      Hi guys , just a little FYI here , i have done at least a dozen of these swaps on A bodys from 67 to 72 and i have never once changed the proportioning valve, the cars stop fine and had no issues what so ever , the master cylinder also works good too , however if you use a master cylinder from a dodge truck with power bakes you get a really nice pedal feel and effortless brakeing . ( I also do not do these with power barkes )
       
      • Like Like x 1
      • Alabama Dart

        Alabama Dart Active Member

        Messages:
        39
        Likes Received:
        1
        Joined:
        Mar 26, 2014
        Location:
        Mobile Alabama
        Local Time:
        3:31 AM
        Great Thread this will be a lot of help now just need to find the donor parts
         
      • mickey_bigdaddy

        mickey_bigdaddy Well-Known Member

        Messages:
        283
        Likes Received:
        9
        Joined:
        Jan 26, 2011
        Location:
        McKinney, TX
        Local Time:
        3:31 AM
        What does this mean? I don't understand how the spindle mounts to a ball joint????
         
      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.