Quote:
Originally Posted by Buehler445
I've never, ever heard of anyone wanting to drain and replace brake fluid, sure add more if they leak or you have to replace a cylinder, but that isn't a thing.
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It's an old car thing, mostly.
Cars that use rubber hoses in their brake systems, especially those in bad weather. Moisture can actually seep into the rubber components of brake systems, even though DOT 3-5 can't seep out. When that moisture seeps in, it creates steam in the brake system as the moisture just builds up. That can cause gumming of the brake fluid in cars that aren't used regularly.