Since I don‘t feel any sponginess in my brake pedal, am I safe in assuming that there is no or little moisture in the brake fluid, and consequently no corrosion is occurring inside the braking system?
Brake fluid is a time change item that is all to often over looked. As it discolours and changes from clear to tan, it is telling you the owner to make a fluid change. The moisture that you make mention of is taken into the system through osmosis i.e. from the relative humidity that is in the air. The climate where you live will play into the effect that it has on your brake system. It may vary from 3 to 5 years for time change of the fluid. Good Luck
Just be jealous that I got mine right here with me. And it's fuzzy. 3
Use your ugly wig/hair for a blanket!
it seems good to me. just make sure the master cylinder s full.
To more directly answer your question, sponginess is usually the result of air in the system or less often, sticking caliper seals. Moisture in the brake fluid causes the opposite of sponginess and there is no simple way to check for moisture content, although the fluid will become cloudy with high levels of water and dark with oxidation particles from the metal (brown from steel and dark gray from aluminium). Since water has a lower boiling point then brake fluid, heat generated by the braking system can cause the moisture to boil and expand and lock up the brakes. Of course, it also causes corrosion on the metal inside the braking system which can cause leaks and the tearing of pressure seals like in your master cylinder. If you have any concerns, have you brake system flushed completely (master cylinder and all four wheels individually). Unless the manufacturer say otherwise, having your braking system flushed about every two years is typical under normal conditions.
