The main components of brake fluid are polyglycol ether and polyglycol. This mixture is still liquid at -40°C and has a very high boiling point of approximately 270°C. It is clear from the composition that brake fluid is hygroscopic - it constantly absorbs water from the air through the expansion tank cap. This is about 2% annually. With a water content of about 2.5%, the boiling point drops to about 150°C. In this case, with very hot brakes (driving in the mountains, full braking, driving with a trailer), steam bubbles can form in the brake fluid, which have the same effect in the brake system as air - the brake pedal falls to the floor when braking. Therefore, for your own safety, replace the brake fluid every two years. If you regularly check your car in a workshop, this is done automatically.
Old brake fluid is disposed of as special waste
Brake fluid is poisonous. Do not touch it with your mouth or open wounds. It does not corrode metal or rubber parts, but is aggressive towards car paint. Dispose of brake fluid drained from the system in any case. Do not use brake fluid from a container that has been open for a long time. Used brake fluid is classified as special waste - dispose of it accordingly.
(The text of the article was copied from the website: FORDBOOK)