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Wanted to post if you 65-66 guys had a power disc brake setup installed by a PO. The 66 has been so dead reliable since the FI install, except for brake fluid would have to be added periodically. The master cylinder was leaking out of the back, and I think through the rusty body! I looked a long time and finally ID'd the master cylinder as a 1977 ish mustang PB setup. The front fitting(drum section) is a 3/8 and the rear fitting is a 7/16(front brake res). The piston is 15/16. The brake setup appears to be stock 4 piston calipers. All the suspension appears stock V8 stuff. Hope this helps someone!
 

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There is usually a casting number on the bottom of the master cylinder that
will identify the part.
 

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Discussion Starter #3
There is usually a casting number on the bottom of the master cylinder that
will identify the part.
Yeah...not!
This thing had nothing(or eradicated). Luckily alot of fleabay sellers give dimensions and fitting sizes. That's how I ran this one down.
 

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If you were happy with the pedal pressure you can probably take your pick of Ford master cylinders for power brake applications with left side ports and 15/16" bore. The MC36445 would probably fit the bill. Ports are 7/16-24 and 3/8-24 and bore is 15/16".
 
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