1. polara383500

    polara383500 Member

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    Master cylinder is leaking out the top by the gasket! What’s the best fix a new master cylinder or try to find a new lid and gasket? I looked for a new seal but can’t find one!
     
  2. CBODY67

    CBODY67 Old Man with a Hat

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    Is the rubber seal ballooned? Pushing brake fluid out past anything in its way? Reason I ask is that if the wrong fluid was put into the system, the rubber master cyl seal expands greatly and usually leaks a bit in the process.

    Might check on the local auto supply store's "HELP!" rack of parts or possibly the Dorman website itself. Single cyl or the later model dual-circuit master cyl?

    Just some thoughts,
    CBODY67
     
  3. mrs49

    mrs49 New Member

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    Put the gasket in a thick baggie, install and trim. Worked on my Harley 20 plus years ago.
     
  4. polara383500

    polara383500 Member

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    It’s dual! No the rubber is always fine when I take the cover off!
     
  5. polara383500

    polara383500 Member

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    Pic

    05391BAF-3642-4631-9CC9-224EE17EDDA7.jpeg
     
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  6. polara383500

    polara383500 Member

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    Like a ziplock baggie?
     
  7. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    It seems to me that you have one of three things wrong... Covers bent, gasket is bad, or the master cylinder is in bad shape where the gasket seals to.

    So, you can replace the cover, seal, or MC. Finding a good cover or gasket means hoping someone has an old one laying around... Or if they have a new one, bet it's not much less than the price of a new MC.

    By the time you get all done, you can buy another MC and be done with it.
     
  8. polara383500

    polara383500 Member

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    When I bought the car it said it was replaced but that don’t mean nothing! I might change it over in the winter when she’s parked!
     
  9. polara383500

    polara383500 Member

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    Can you upgrade the master cylinder to a Wilwood or something like that? When I look for replacements it’s hard to find them!
     
  10. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    Why do that? No advantage at all except having some bastard piece that you have to probably change line fittings to make work.

    Those master cylinders are easy to get. Try Rock Auto
     
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  11. polara383500

    polara383500 Member

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    Rock auto or nobody had a
    rock auto or nobody else has disc and drum master cylinders! Just drum and drum
     
  12. MrMoparCHP

    MrMoparCHP Senior Member

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    I just got on for my 69 through Rock Auto, like last week. It should be the same.


    Alan
     
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  13. PH27L7

    PH27L7 Well-Known Member

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    IMHO not correct...
    More Information for CENTRIC 13063047

    I should have a spare cover & gasket lying around if you want to go that route. Before you do that though you should inspect the sealing surface to make sure there are no imperfections that would cause the leak.
     
  14. CBODY67

    CBODY67 Old Man with a Hat

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    IF you want a Wilwood master cyl, you'll probably need the entire Wilwood disc brake conversion kit to go with it . . . as a matched set. There should be an OEM m/cyl available for you with disc/drum brakes, probably all the way to at least the 1973 model year C-body cars. starting with 1967 applications. LOTS of useage, it would seem.
     
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  15. Imperial dude

    Imperial dude Member

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    How tight is the bail?
    I had the exact same problem, took the rubber out, cleaned the rubber, lid, mating surface on the master cylinder, and bent the bail so it fit tighter and never had the problem again
     
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  16. polara383500

    polara383500 Member

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    I’ll try that