[COLVERT]

Originally Posted by Ross R75

An interesting story, but without a source link, unfortunately it's a "my mate Dave".

Brake fluid has 2 boiling points. We know it absorbs moisture over time, so it has a "dry" boiling point for new untainted fluid, and a wet boiling point for old fluid 2-3 years old. In the case of DOT4 brake fluid that will be in most of our cars, the wet boiling point is 60 degrees C lower than the dry boiling point. That's a huge difference.

When the brake fluid boils, any water in it turns to steam. Steam/vapour can be compressed, which means that effort at the pedal isn't reaching the brake caliper pistons and braking performance is reduced.

I'll continue doing mine every time I buy a used car, and every 2 years thereafter. Others may differ, as is their right.

Doesn't the water boil BEFORE the brake fluid ??? Thus moving the brake fluid from where it's most needed.