Ford Repair: Brake Fluid, boiling temperature of water, wheel cylinders

Question
I'm an electrical engineer by profession and worked on cars a long time ago while paying my way through college. Recently there is this trend to have brake fluid changed regularly because of lowered boiling temperature due to increased dissolved water in the brake fluid. I am unable to ascertain the typical pressure in the brake system but from some articles it appears to be over 1,000  psi. So, conservatively speaking, the boiling temperature of water at or above 1,000 psi is at least 545 degrees F. From what I have read, brake temperatures seem to run around 300 degrees F for stock car racing. Then what is the concern over moisture bubbles in the brake fluid if the brake fluid will never reach it's boiling point while under 1,000 psi? If my figures are wrong please let me know. Thanks.

Answer
your asking the wrong person ask somebody from ford-i do know master cylinders-wheel cylinders-and calipers corrode or pit on the inside pure brake fluid shouldn't cause that. while your at it what good does water pump lubricant sold in parts houses do the liguid doesn't reach bearing.