Quote:
Originally Posted by vash
I had that.
Brake lines. They swell on the inside so fluid can’t back out. - or something.
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Yep, the inside of the hose can swell over time to the point where it either doesn't let fluid past or even worse, turn into a *check valve* where it only allows it to pass or flow in one direction. It's fortunately rare but catastrophic if it occurs. I change the hoses on every older car I work on if they are more than about 12 years old.