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Not quite true. As brake fluid is Hygroscopic (it absorbs water) it's density changes. The watery stuff sinks to the low areas. It also heats up and as we know hot fluid will rise in cool fluid (density change). This is why the bottom of a master cylinder rusts ( internally) and why we should replace the fluid regularly.
that may be the case but ive never changed brake fluid in my life on any car(unless working on them),and I recon im not alone.do manufacturers recommend that in services
 
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