The SAE J2681 inertia-dynamometer procedure
evaluates the influence of pressure, temperature, and
linear speed on the coefficient of friction of the material
tested. The procedure is a useful tool to compare
different friction materials under identical test conditions.
To take into account the different types of dynamometer
cooling systems, the fade sections are temperaturecontrolled.
The types of brakes and discs used will vary
according to individual projects.