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Discussion Starter · #1 · (Edited)
I have a 63 wagon with manual brakes and have just replaced the master with a single port one operating all 4 wheels . I believe this is a 1" bore pt number
C3AZ2140B.
I want to swap this for a drum /drum master with separate ports for front and rear, has anyone done this swap and what part did you use .
I need it to be a straight swap onto bulkhead and pedal rod , I know I will have to make new brake lines but that is not a problem .
I'm not sure if I need to keep it a 1" bore or increase/decrease the size
Thanks in anticipation mark ,England
 

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1967 was the first year dual circuit master brake cylinders were required. I would start my search there. I am changing from manual drum to manual front disc in my 66 Fairlane. I am using a 74 Maverick master cylinder. As long as the bolt spacing and the push rod length fit, you should be able to make it work if sized correctly.

A smaller diameter will give you more brake pressure. It must be sized correctly to supply enough fluid before you run out of stroke. In 1969 according to my shop manual, all the manual master cylinders were 1 inch bores.
 
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