Years back I was doing a service interval on the Wife's Honda and listed right there was
Flush and replace brake fluid.
Whuuut?
I took a turkey baster and drew the fluid out of the master cylinder, then poured in fresh DOT 3.
The old fluid was dirty looking and to my surprise, the brake pedal feel actually improved by a noticeable amount. The fresh fluid didn't compress like the old stuff so the brakes felt better.
I use DOT 5 in just one car for now and that one has a paint job that I want to keep nice. The other cars that I have here are ratty so who the heck cares if I get a spill on them ??
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