Hello, brake fluid always pulls water. But I could imagine that it does not pull so much with a vehicle which is driven little. After all, it is not so much moved and is subject to less temperature fluctuations. Then you would have to be able to extend the change interval with a seasonal vehicle which is moved only less than 1000km/year. Or if I am wrong with my guess and brake fluid always pulls the same amount of water – no matter if it is only i m System “stands around” or is constantly moving and hot-cold is subject to fluctuations?