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Message: <blockquote data-quote="95-stang" data-source="post: 528511" data-attributes="member: 9031">Your older type fluid is pretty anhydroscopic, ie it absorbs moisture, most cars i get in for service state change the fluid around every 3 years or at certain service intervals.Newer silicone based fluids are better, boil at higher temps, and resist moisture better.I dont think they are deliberately trying to rip people off as it should be changed at some point, sooner if its never been done rather than later but its a service you pay for of course.I use an air pressure bleeder, that way your not pumping the master cylinder up and down like a lunatic, you just force fluid through each bleed nipple until it comes out clean.Rule of thumb is if the fluid looks dirty in the master cylinder, then change it.</blockquote>