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Old 11-06-2009, 07:51 PM
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master cylinder plumbing

Guys
Help me out. This may look like a stupid question but, here goes. How do you distinguish which port is which on a master cylinder ( front and rear)? I got a #mc39027 master cylinder (1976 to 1980 Chevy Monza m/c) to go under my 34 Ford. I need to go to a 7/8 bore master cylinder to achieve better braking. And I don't want to plumb it wrong.

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Old 11-06-2009, 08:13 PM
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First port from mounting bolt goes to front cylinder, second port goes to rear cylinders, generally.
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Old 11-06-2009, 08:15 PM
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Please diregard my previous post.
I was generalizing, and this is too important of an issue for that.

Last edited by 66GMC; 11-06-2009 at 09:10 PM. Reason: Generalizing.
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Old 11-07-2009, 08:09 AM
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thanks guys, in further looking I found out. Large reservoir side goes to the front. Feel like I should have known this but,didn't. Thanks again
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Old 11-07-2009, 08:50 AM
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The larger of the two master cylinders reservoirs always goes to disk brakes which are usually on the front of the vehicle. Disk brake calipers require a greater quantity of fluid than drum brake cylinders.

Vince
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