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14 To determine how to run the power brakes and automatic-transmission steel lines off the intake vacuum fitting, we looked through our shop manuals, Osborn Reproductions assembly manuals, restoration guides, and Bob Mannel's Mustang & Ford Small-Block V-8, 1962-1969. Some books showed both installed, like the erector set we built here. But we got the correct word from Mannel's book: For '66 Mustangs with an auto trans and power brakes, the booster got its vacuum from the intake fitting (steel line running toward the valve cover), and the auto trans sourced its vacuum from the check valve on the brake booster. Now we know.