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Good point.. the oem fluid may not be as good as Ford wants it to be.
If the boiling point reaches 400 or above brake fluid breaks down rapidly.
I was wondering myself why I had cars that the fluid always stayed nice and clean for years and why my 2001 windstar looked like muddy water.
I know that the van is bigger and heavier than a car but I seen chevy trucks with cleaner fluid than the van of the same age or older. I also know that you should bleed the brakes every 2 yrs to replace or replinish the fluid but not every one does..Or use a turky baster to remove the old and add some new.. As for the brakes not working when you needed them, the heat stress from the back most likley sent the hot fluid back to the front causing a spungy pedel.. But you still should of had a little stopping power from the front. I would have those back brakes replaced along with the fluid.... Oh forgot to mention its not really isolated it can still flow to the front and mix.
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