Dot 3 brake fluid does have the ability to absorb moisture which is why I will be using it in my 51 gmc. If any moisture gets in the system it will be absorbed by the fluid and will protect the internal parts. If you have any moisture in your system without a hydroscopic fluid, the moisture will settle at the low spots and start to corrode the internals. Have a look at this page to help aid in your decision. smile

http://www.motorcycleproject.com/motorcycle/text/cows-brakefluid.html