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I've just received my December 2013 issue of Mustang Monthly (M/M) and there is a article titled Identify Dual-Chamber Master Cylinder Caps. The article deals with concours detailing for 1967-1973 M/C caps. In the article the author (Marcus Anghel) states that " in 1966 Ford decided to start referencing its own brake fluid part number (C6AZ-19542-A) on M/C caps due to concerns about the higher temperatures created by front disc brakes" I sent a e-mail to the author asking if he knew when in 1966 did Ford start doing this. It sounds like he has done some research and I'm hoping to hear back from him.
.............The author states that the 1966 part number carried over into early 1967 Fords with the dual chamber M/C disc brake cars utilizing a different shape sticker than was used on the 1966 single chamber M/C.