well replaced bad spots in my brake lines under neath drivers side rocker, and while removing air from system decided to flush brakes , the fluid was dark brown, now nice and clear used prestone dot 4 full synthetic.wish I got a bleeder system ,but the wife worked out at pumping the brakes , she didn`t complain to much lol.

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2003 bmw x5 3.0i ,219000km build date 2003-08-18