This is available in two sizes, 250ml or 500ml bottle. If you're flushing fluid you'll need the large bottle. Handy motorcycle brake fluid tip: Brake fluid is like acid if it gets on your bike so wrap up the plastics under your master cylinder in rags. Also, cover your wheel rims in rags. When you're finished working on your brake system rub down any areas that may have contact with a fluid like WD40.