Thanks for that Dave, makes sense and I did get rear cylinder seizures on my old 4/4.
So the fluid reservoir moisture check should be a good indicator for the whole system.
Can't wait to play with my new toy.
Sorry, but cannot quite follow the logic here.
Dave is saying that the rear cylinders often exhibit fluid far dirtier than the fluid reservoir, as moisture gets in through the seals on the brake cylinders, which I totally agree with.
But, I don't think that one can then conclude that the moisture level in the reservoir will be in any way indicative of that in the rear. They simply aren’t going to mix under normal circumstances.
So I think even if you had an acceptable moisture level from testing after say, 2 or 3 years, it would be folly not to change the fluid.
Think your original thoughts in your previous posting on the subject, virtually answered the issue.