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1956 Cadillac master cylinder

Started by Caddy41girl, July 30, 2015, 06:56:34 PM

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Caddy41girl

July 30, 2015, 06:56:34 PM
I have a friend who is restoring his 1956 Cadillac and we are stumped by this master cylinder. Can anyone tell me what this pin sticking out of it is for? I have drawn an arrow to it. It is leaking oil out. Thanks

J. Gomez

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July 30, 2015, 08:29:20 PM
It is a vent port, the opening goes up to the vacuum seal on the M/C plug. If the seal fails vacuum will escape via this opening.

If you have brake fluid dripping from there it could be a problem with the hydraulic secondary seal inside the M/C. The M/C would need to be rebuilt.

Hope this helps..!
J. Gomez
CLC #23082
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