Previously in alt.autos.lexus, "TURTLE" proclaimed :
ye GAD. Your full "byrd" Colonel is an idiot. Having spent MANY years in the military myself, I have absolutely *never* heard of ANY recommendation to put water in a braking system as a replacement for brake fluid. Of course, in an absolute emergency, all bets are off, but NEVER for any extended period of time.
Milspec brake fluid is silicone based DOT 5, which is non-hydroscopic. In other words, water isn't absorbed by the brake fluid. Water will "sit on top" of the brake fluid. Yes, it will displace any missing fluid however "in the field", if you're missing enough brake fluid to have to resort to such drastic measures of putting water in the braking system, you've got more serious problems than low brake fluid.
Additionally, one of the more serious reasons you don't put water in your braking system is the low boil point of water. In a rugged environment, and even under heavy towing, the braking system will boil over very quickly. You'll end up with NO braking and in some instances a completely seized braking system.
I have no idea where your friend came up with this idea, but he is totally, absolutely, unequivocally full of shit.
Folks, DO NOT EVER, EVER, EVER *EVER*, put water in your braking system! EVER!
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