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The brake fluid recommended for the 2007 Ford Focus is DOT 3, which has a dry boiling point of around 401 degrees Fahrenheit and a wet boiling point of about 284 degrees Fahrenheit. It's important to note that these boiling points are estimates and can vary since there isn't a set formula for most brake fluids. Most DOT 3 fluids exceed these temperatures easily. DOT 3 fluid typically contains an 80% glycol ether base, which is known to absorb water. While you can substitute DOT 4 for DOT 3, you should not use DOT 3 in place of DOT 4 because it can cause the brake fluid to boil.
As per the manual for the 2008 Ford Focus, the recommended brake fluid is DOT 3.