Replace Master Cylinder

Brakes for your Classic Mopar

  1. 1969VADart

    1969VADart FABO Gold Member FABO Gold Member

    Messages:
    2,188
    Likes Received:
    498
    Joined:
    Aug 19, 2013
    Location:
    Fredericksburg, VA
    Local Time:
    10:35 AM
    Is there a direct replacement for the master cylinder in this picture? This is the stock MC for my 69 Dart GT with four wheel drum brakes. I would like to replace this as part of my cleanup under the hood. Would appreciate any advice on the best replacement for this MC. Also, is there a direct replacement for those metal lines that come off of the MC as well?

    [​IMG]
     
  2. 1969383S

    1969383S FABO Gold Member FABO Gold Member

    Messages:
    4,799
    Likes Received:
    1962
    Joined:
    Jan 8, 2012
    Location:
    Cumming, GA.
    Local Time:
    10:35 AM
    Lines are available from many sources. Inline tubes sell them as well as others.

    I have some NOS ones.

    The master is another issue. Looks like an original to me. The after market ones will appear different but function the same. If you do not rebuild it you might want to keep it and not turn in as a core. These are getting hard to find and a someone doing a serious restoration will buy the core for way more than the turn in value.
     
  3. 67Dart273

    67Dart273 FABO Gold Member FABO Gold Member

    Messages:
    40,330
    Likes Received:
    7990
    Joined:
    Oct 14, 2010
    Location:
    Idaho
    Local Time:
    7:35 AM
    That does NOT look like a drum master. The larger rear section says "disk"
     
  4. 1968FormulaS340

    1968FormulaS340 Well-Known Member

    Messages:
    11,557
    Likes Received:
    462
    Joined:
    Aug 24, 2005
    Location:
    St. Helens Oregon
    Local Time:
    7:35 AM
    Yup.
     
  5. BillGrissom

    BillGrissom Well-Known Member

    Messages:
    7,284
    Likes Received:
    348
    Joined:
    May 10, 2009
    Location:
    Sacramento
    Local Time:
    7:35 AM
    I had a 69 Dart with 9" drum brakes. The MC was different, with equal size reservoirs, not the large rear one everyone here notices. That MC was almost always on disk cars, but never say "always" with older U.S. cars. First priority was keeping the assembly line running, so who knows if they raided another part bin. Are you 100% sure you don't have front disks (especially since a GT car)? If you do, jump for joy. If it ever did have front disks, you probably still have a "combination block" for that instead of the simple "distribution block" on drum-drum cars. Search for photos to compare.
     
  6. clinteg

    clinteg Well-Known Member

    Messages:
    2,480
    Likes Received:
    795
    Joined:
    May 17, 2007
    Location:
    KS
    Local Time:
    9:35 AM
    I just bought an aluminum master cylinder from Dr Diff. So much lighter than the drum MC I took off. I'm also using Copper Nickel brake lines. These things are amazing. So easy to bend, they don't kink, not supposed to rust, and they look nice. I put a full loop in one line and found the line was too short. So I completely unraveled the loop and did the routing completely different. You can't tell that I ever looped the line and re-bent it. Did it all by hand with no bending tools.
     
  7. Johnny Dart

    Johnny Dart Well-Known Member

    Messages:
    7,458
    Likes Received:
    1669
    Joined:
    Nov 30, 2006
    Location:
    So Cal
    Local Time:
    7:35 AM
    Go down to Oreillys,Kragens,Auto zone,whatever you have close.
    Tell them you need an Master Cylinder for a 1973 Dart with disc brakes.
    Bolt it on. Put in drive.

    Brake lines from inline tube.
     
  8. Dartman1969

    Dartman1969 69 Dart Custom

    Messages:
    626
    Likes Received:
    14
    Joined:
    Aug 16, 2011
    Location:
    Kelso, Washington
    Local Time:
    7:35 AM
    My 69 with drum brakes had equal sized ports and a bolt down lid.
    ~Michael
     
  9. 70DartMike

    70DartMike Too many projects

    Messages:
    7,606
    Likes Received:
    258
    Joined:
    Jul 17, 2007
    Location:
    Vancouver Island, Canada
    Local Time:
    7:35 AM
    A drum/drum master cylinder for your car should look like the one in this picture.

    [​IMG]
     
  10. inertia

    inertia Well-Known Member

    Messages:
    3,161
    Likes Received:
    485
    Joined:
    Feb 4, 2011
    Location:
    Victoria B.C. Canada
    Local Time:
    7:35 AM
    mine too.. equal sized reservoirs, bolt down lid..
     
  11. 67Dart273

    67Dart273 FABO Gold Member FABO Gold Member

    Messages:
    40,330
    Likes Received:
    7990
    Joined:
    Oct 14, 2010
    Location:
    Idaho
    Local Time:
    7:35 AM
    Can you find documentation to support this, because what I'm seeing "says" the opposite. Maybe some replacements are different?
     
  12. 70DartMike

    70DartMike Too many projects

    Messages:
    7,606
    Likes Received:
    258
    Joined:
    Jul 17, 2007
    Location:
    Vancouver Island, Canada
    Local Time:
    7:35 AM
    Sorry, every Dart I've had from '69 with front and rear drums has had the 2 round caps, with equal sized areas for fluid, unlike disc/drum which is large/small.

    My 13,000 mile '70 Dart had the same one for drum/drum.

    [​IMG]
     
  13. 1969VADart

    1969VADart FABO Gold Member FABO Gold Member

    Messages:
    2,188
    Likes Received:
    498
    Joined:
    Aug 19, 2013
    Location:
    Fredericksburg, VA
    Local Time:
    10:35 AM
    I am absolutely certain my car is a factory drum/drum car. That being said, I asked this question because when I was looking at re-manufactured MC's (like Cardone), the one that is on my car looked like the ones they are selling as disc brake MC's. So I am not sure whether to just reorder one that looks like the one on my car, or something else.
     
  14. 67Dart273

    67Dart273 FABO Gold Member FABO Gold Member

    Messages:
    40,330
    Likes Received:
    7990
    Joined:
    Oct 14, 2010
    Location:
    Idaho
    Local Time:
    7:35 AM

    I'd order one to specify drum. The other thing about drum / drum masters is that they have what is called residual valves in the master. The disc section of a disc master does not.
     
  15. 1969VADart

    1969VADart FABO Gold Member FABO Gold Member

    Messages:
    2,188
    Likes Received:
    498
    Joined:
    Aug 19, 2013
    Location:
    Fredericksburg, VA
    Local Time:
    10:35 AM
    Is it possible that the base of the master cylinder is correct but the lid could have been replaced?
     
  16. Woods74

    Woods74 Quick Senior

    Messages:
    6,003
    Likes Received:
    216
    Joined:
    Aug 21, 2010
    Location:
    Seattle, WA
    Local Time:
    7:35 AM
    No, the lid is the same shape as the master cylinder tanks.
     
  17. 1969VADart

    1969VADart FABO Gold Member FABO Gold Member

    Messages:
    2,188
    Likes Received:
    498
    Joined:
    Aug 19, 2013
    Location:
    Fredericksburg, VA
    Local Time:
    10:35 AM
    I guess I will just order one that I know is supposed to be for a drum/drum car to be safe and correct.
     
  18. Woods74

    Woods74 Quick Senior

    Messages:
    6,003
    Likes Received:
    216
    Joined:
    Aug 21, 2010
    Location:
    Seattle, WA
    Local Time:
    7:35 AM
    Cool, kill them drums when you get a chance. :D
     
  19. inertia

    inertia Well-Known Member

    Messages:
    3,161
    Likes Received:
    485
    Joined:
    Feb 4, 2011
    Location:
    Victoria B.C. Canada
    Local Time:
    7:35 AM
    This is the original M/C off my 69 Swinger, which I've owned since new..

    Hope it helps
     

    Attached Files:

  20. 68383GTS

    68383GTS Well-Known Member

    Messages:
    7,306
    Likes Received:
    799
    Joined:
    Nov 15, 2007
    Location:
    East Peoria,IL
    Local Time:
    9:35 AM
    Rockauto.com
     
  21. Dartman1969

    Dartman1969 69 Dart Custom

    Messages:
    626
    Likes Received:
    14
    Joined:
    Aug 16, 2011
    Location:
    Kelso, Washington
    Local Time:
    7:35 AM
    That's what mine looked like as well!!

     
  22. rich006

    rich006 Learning as I go

    Messages:
    421
    Likes Received:
    64
    Joined:
    Nov 21, 2013
    Location:
    Annapolis, MD
    Local Time:
    10:35 AM
    I know I'm late to the party, but that MC looks like the one on my '74 Swinger with drum/drum brakes (mine matches the picture in the 1974 shop manual). I'd guess maybe someone replaced your original '69 drum/drum MC with a later-model drum/drum MC.
     
  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.