Precautions: Brake fluid is poisonous. Never suck brake fluid through the hose with your mouth. Pour brake fluid only into a container that closes tightly.
Brake fluid must be changed regularly because it absorbs moisture from the air through the small pores in the brake hoses. Since the brake caliper can become very hot during braking, brake fluid with a high water content can boil. Steam bubbles form in the brake lines. Steam, unlike liquid, can be compressed, so the pressure from the brake pedal will no longer be transmitted to the brakes of individual wheels, i.e. they will not work. After bubbles form once, they remain in the brake hydraulic system even after the brakes have completely cooled down.
Salt on winter roads or salty sea air accelerates the penetration of water into the brake fluid. If necessary, change the brake fluid more often.
Replace brake fluid every 3 years, preferably after the cold weather ends.
Brake fluid is quite caustic and should not come into contact with the painted surfaces of the car. If this does happen, wash it off immediately with plenty of water.
For these reasons, brake fluid should only be stored in a closed container. Fluid that has been stored for a long time and whose container has been opened at least once cannot be used.
Brake fluid should not come into contact with mineral oils and solvents. Even small amounts of mineral oil will make the brake fluid unusable or cause the brake system to fail. Plugs, seals and boots of the brake system will be damaged if they come into contact with mineral substances (oils, solvents, gasoline, etc.). Never use oily rags to clean parts.
Brake fluid that has already been used in the brake system should not be reused. When bleeding the brake system, only use fresh brake fluid.
Brake fluid requirements: DOT 4 or Super DOT 4.
Note: Use only brake fluid of the specified standard, as plastic and rubber parts of the brake system are designed to use only a certain type of fluid.
[The article is copied from the website MazBook]
Do not drain old brake fluid into the sewer.