Just type in brake*fluid*contamination*
That should give you all kinds of info.
I have been studying brakes and brake fluid for some time now. Contaminated brake fluid can be very dangerous, in a panic stop. Brake fluid is hydroscopic which means it draws moisture from every where. Any thing at 3% moisture and over, lowers your boiling point of the fluid. That converts to steam in hot brakes which means you do not have bad brakes, you got
:-{} NO BRAKES. :-{} .
I have an 04 dually, it has 10,000 miles on it. Purchased a brake fluid moisture tester the other day to test my fluid. It tested at over 3%. #@$%! I was shocked. It was also very dirty and dark looking. When I had it flushed, the front bleeders, when opened and removed, the fluid would not even flow using gravity. They were plugged and had to be forced out using other means.
When was the last your mechanic talked to you about brake fluid? Likely never. Not a whole lot of $$$$ in brake fluid flushes.
What you don't know about your brakes could hurt you.
Be safe people.