Originally Posted by gpb
Does water propogate through the fluid evenly? i.e. is testing it in one spot (such as the master cylinder resevoir) valid for the fluid condition in all the calipers as well?
As mentioned brake fluid is hygroscopic absorbing moisture from the air
thus lowering the boiling point.
And yes it will eventually cause brake failure due to pockets of steam in the brake lines etc.
This can happen e.g. going down a mountain with long periods of brake