Power Stop TDK4400 Track Day Brake Kit Components designed for Track Days and High Performance Driving Events Platform-Specific Track Day friction compound features Extreme Fade Resistance, Low Thermal Conductivity, Consistent Pedal Feel & Modulation. All components are tested on the track, this is not a re-purposed street compound. The Power Stop team spent countless track hours using advanced vehicle data-loggers to develop the best friction compounds. Official brakes of the Bondurant Racing School.