The test is performed on different kind of wet asphalts or concrete pavements, making the test vehicle brake from 85 km/h to standstill with ABS activated. Speed and distance are measured by a GPS-based device equipped with optional sensors like a brake switch, accelerometers or wheel speed sensors. The braking distance and the deceleration are plot every 5 km/h in order to clearly identify the different design contributions to the wet braking overall performance (hydroplaning and grip). It is also calculated the distance and deceleration between 80 and 20 km/h in order to fit with the most common wet braking metric excluding the influence of the brake pressure build-up time and the car ABS logic at low speeds. A deep data analysis to recognize the ABS logic impact and its matching with the tires characteristic is also possible. A track conditioning with out of test tires is mandatorily required before starting the test. The test starts with the control tire set to be re-tested at the end of the session in order to keep into consideration possible changes of the test conditions. Up to 7 brakes are measured for each tire set and the average deceleration is considered for the overall result (expressed in %).
