Quote:
Originally Posted by CFZ
ss lines are to keep the brake pressures consistent, because the lines do not expand. It doesn't really have anything to do with brake fluid staying drier.
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Pressure isn't lost with rubber lines, but
fluid volume is. In other words, as I press the pedal and the rubber lines expand, more brake fluid must be provided by the master cylinder to keep filling the growing line volume. With SS lines, nearly zero growth means less pedal travel at the same pressure level as compared to OE lines.
OE rubber lines are the main pathway for moisture ingress in the brake system. This is why most manufacturers recommend changing brake fluid every two years. It's the moisture that lowers the boiling point and can eventually cause internal component corrosion. SS lines do not allow moisture through them, keeping the fluid "drier" -- or with a lower moisture content for a longer period of time.