Brake fluid can easily get contaminated with dangerous solvents. While it is high in alcohol, it cannot be left to evaporate. Most brake fluids used today are glycol-ether based, but mineral oil (liquide hydraulique minéral or LHM) and silicone-based (DOT 5) fluids are also available. Glycol-ether is a poisonous compound sweet to the taste, and thus attractive to people and animals. Throughout its use, it can absorb heavy metals such as copper and zinc, turning it into a contaminant.
There are quite a few complexities surrounding brake fluid and its disposal. Waste brake fluid should be kept in separate containers from other waste oils. A comprehensive automotive waste management solution can help you manage and dispose of brake fluid collection and disposal.