The brake fluid used in hydraulic system of brakes is poisonous therefore at its hit on skin it is necessary to wash away immediately its large number waters.
If liquid on imprudence got into eyes or in an organism, it is necessary to see a doctor immediately.
Besides, brake fluid dissolves paint and plastic therefore at hit of liquid on a paint and varnish covering of the car wash out its large number waters.
Brake fluid is hygroscopic, that is absorbs moisture from air therefore it is not recommended to use the liquid which is stored a long time in open ware.
Brake fluid should not contact with mineral oils. Even a small amount of mineral oil worsens properties of brake fluid and can put out of action and the brake system.