Treat this product as hazardous waste. It should never be put in the garbage or poured down drains.
Brake fluid is a flammable product which contains solvents in the form of glycols. Brake fluid is a poison and, if ingested, may cause central nervous system depression and kidney failure.
Used brake fluid contains lead and other heavy metals in addition to solvents. These heavy metals can pose an environmental danger if disposed of improperly.
If you can’t avoid using some hazardous products, safe disposal is very important
To dispose of your Household Hazardous Waste (HHW) products, keep them in their orginal container if possible, or drain into a container with a secure lid for safe transporting to a drop-off site.
DO:
• Keep household hazardous waste products separate (do not mix).
• Bring products in their original containers when possible.
• Seal products to prevent leaks and spills.
• Keep products away from the driver and passengers, i.e., in a trunk, truck bed, or trailer.
• Keep children and pets away from collection sites and events.
DO NOT:
• Exceed 25 gallons or 220 pounds of household hazardous waste per event.
• Do not bring unlabelled, empty or leaking containers, asbestos, explosives or ammunition, radioactive or infectious waste, or business-generated waste to the collection site.
Here is some information from the United States Environmental Protection Agency on Hazardous Waste: http://www.epa.gov/epaoswer/non-hw/househld/hhw.htm
And some information from Canada: http://www.atl.ec.gc.ca/udo/put.html