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Brake tubing is measured by OD and the NPT pipe is measured by ID. The inner diameter of 3/8" brake tubing is around 1/4" so, the fittings will tend to be 1/4" NPT for 3/8" tubing. Your mileage may vary.
Rustystud has a great post on replacing airlines with DOT nylon tubing. http://www.steelsoldiers.com/showthread.php?155917-Replacing-copper-lines-with-DOT-poly-air-hose
Depending on your budget replacing all the fittings can be a bit much. The push to connect stuff is great. They are...