A general recommendation is to change the brake fluid every 2 years, as brake fluid is hygroscopic.#
VW recommends the first change for new cars after 3 years and then every 2 years.
Why is the first change only recommended after 3 years? I do not know.
In any case, the water content in the brake fluid should be checked at appropriate intervals!
This is possible with simple testers and is done by every responsible workshop,
