This standard specifies the methods of measuring the performance of service and parking brakes of agricultural and forestry vehicles. For the purposes of this standard, the following categories are considered: Category A — Agricultural and forestry tractors Category B — Self-propelled agricultural vehicles (Self-propelled machines) Category C — Agricultural trailers Category D — Towed agricultural machines This standard applies to the machines included in the aforementioned categories as long as they reach a maximum speed greater than 6 km/h and do not exceed 40 km/h.