How do I check the Secondary Brake Pressure Sensor located on the Brake Booster? on 2005 Ford Explorer Sport Trac

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Where can I purchase one?
Two local FORD DEALER can not find a part number for it.
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