Kinematic viscosities.
S5.1.3. Kinematic viscosities. When brake fluid is tested according to S6.3, the kinematic viscosities in square millimeters per second at stated temperatures shall be neither less than 1.5 mm 2/s at 100 C. (212 F.) nor more than the following maximum value for the grade indicated:
(a) DOT 3: 1,500 mm
2/s at minus 40 °C. (minus 40 °F.).
(b) DOT 4: 1,800 mm
2/s at minus 40 °C. (minus 40 °F.).
(c) DOT 5: 900 mm
2/s at minus 40 °C. (minus 40 °F.).