Actually you SHOULD change the brake fluid in your car/truck etc. approx. every two years. Most people forget the little service item. I remember not doing it for my Aerostar for several years and one day the ABS light came on. A brake shop quoted $600 to fix. I flushed the system and bounced the little float thingie in the master a couple times and ABS light went out. So, I flush mine every couple of years. By-the-way-It's a '95 with 177K and still has the OEM master and wheel cylinders. I guess it pays in the long run.
Earl I keep saying Im gonna do my truck........but I keep forgetting. Its a 94 that Ive had since thanksgiving of 93 with over 200,000 miles and all OEM master and slave cylinders and OEM fluid too, that must be some GOOD stuff, why get rid of it now