Brake fluid change?

dougrainer wrote:

otrfun wrote:
We siphon (with a vacuum brake bleeder) all the brake fluid out of the reservoir every year or two on all our vehicles, then refill it with new synthetic brake fluid. Takes about 12-16 oz. to refill the cars and 32 oz. for our Ram 3500. Literally takes all of 2-3 minutes to do. Can't say there's some dramatic improvement in braking, but it's nice to see the fluid clear with so little effort and cost. Still do the occasional brake bleed. When we do, the brake fluid is significantly clearer vs. how it normally looks when we don't do the siphon and fill.

This does NOT make any sense. What about the fluid in your Lines and calipers that is OLD? If you do anything it would be to flush and bleed the complete system. Not the occasional bleed. Doug

You missed the point. What I'm doing is the very same thing as a drain and fill on most automatic transmissions. In a drain and fill you only remove, say, 50% of the tranny fluid. Removing 50% of the old fluid (or 50% of the old brake fluid) is still a significant improvement over doing absolutely nothing. Also, keep in mind this brake fluid siphon/drain and fill only takes 2-3 minutes. We typically do it once a year. It's above and beyond what the manufacturer requires, so it's a good thing and no harm done. Lastly, we still do a complete brake bleed. When we do the total brake bleed it's hard not to notice the fluid is much clearer than if we hadn't done the brake fluid drain/siphon and fill. Bottom line, we've found a brake fluid reservoir siphon/drain and fill well worth 2-3 minutes of our time. As always, YMMV.