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Author Topic: 1941 Cadillac Series 63 Sedan Master Cylinder Leak  (Read 284 times)

Offline J. Russo

  • Posts: 152
  • CLC Number: 65003835
  • Name: JOHN P. RUSSO
1941 Cadillac Series 63 Sedan Master Cylinder Leak
« on: November 03, 2020, 10:19:44 AM »
Can anyone tell me if this can be repaired? I have attached some photos that show the diagram of the type of master cylinder I have as well as where I have a leak in the back of the reservoir.  There is a round indentation where fluid is seeping through. The diagram doesn't show a part in the area that is leaking. Thank you

Offline Jim Miller

  • Posts: 285
  • Name: Jmiller
Re: 1941 Cadillac Series 63 Sedan Master Cylinder Leak
« Reply #1 on: November 03, 2020, 04:56:38 PM »
If you are not concerned with authenticity, consider a bracket from Art Gardner that holds a Wilwood dual master cylinder. Art's bracket fits in perfectly on the 41 and you gain the safety of a dual system. Worked great for me.
Jim Miller

1941 6219
1949 6237X
2021 XT6
Past:
1991 SDV
1999 DeElegence
2006 DTS
2013 XTS
2016 SRX

Offline Brad Ipsen CLC #737

  • Posts: 1273
  • CLC Number: 737
  • Name: Brad Ipsen
Re: 1941 Cadillac Series 63 Sedan Master Cylinder Leak
« Reply #2 on: November 03, 2020, 09:25:50 PM »
That is a casting core plug just like in an engine which in that case is sometimes called a freeze plug.  This is a cup that is expanded in a hole machined in the casting.  To replace you would have to take everything apart and typically would replace the seals, etc. all at the same time.  Also sleeve the cylinder if required.  Or as an alternate buy a complete new master cylinder which I believe are available.
Brad Ipsen
1940 Cadillac 60S
1938 Cadillac 9039
1940 Cadillac 6267
1940 LaSalle 5227
1949 Cadillac 6237X
1940 Cadillac 60S Limo

Offline Jay Friedman

  • Posts: 2536
Re: 1941 Cadillac Series 63 Sedan Master Cylinder Leak
« Reply #3 on: November 03, 2020, 10:20:21 PM »
If you can't get a Gardner/Wilwood Dual Master Cylinder kit, best thing is to have it rebuilt and sleeved with either brass or stainless steel.  Best places to do this are White Post Restorations or Hagen's HiWay Auto Parts in Wash. state.
1949 Cadillac 6107 Club Coupe
1932 Ford V8 Phaeton (restored, not a rod).  Sold
Decatur, Georgia
CLC # 3210, since 1984
"If it won't work, get a bigger hammer."

 

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