British Pendulum Test (microtexture), aims to perform a wet skid resistance test. Measurement of the friction coefficient using the Pêndulo Britânico.
The friction created between the tire of a modal and the pavement is responsible for maintaining the direction of a vehicle on the highway, which is strongly interfered by weather conditions, mainly from rain and excess moisture on the pavement surface. The presence of water on the surface of the pavement, in contact with the tire, causes hydrodynamic pressures to be generated in the tire / pavement contact zone and, depending on the amount of water and the speed of the vehicle, the phenomenon of hydroplaning can occur, which is the lack of grip between the tire and the surface of the road making it impossible to perform any maneuver requested by the driver.
The friction between the surfaces must be understood as the sum of two parts. One is related to adhesion at the points of contact between the two surfaces, final contact between exposed aggregates and the tires. The second portion appears if the irregularities in one of the surfaces produce deformations in the other in order to change its original shape.