Brake fluid should also have a very distinct color. If it's discolored in any ... DOT 3, for example, may also present in shades of green, blue, or red. DOT 4, which is a longer-lasting variety ...

DOT 3 Brake fluid: Comes in clear or yellow, but will sometimes have blue, green, and red shades ... to replace your brake fluid if the strip's color falls in the “required service” category.