1. Trailers and semi-trailers with an all up weight of 8,000 kg or more.
  2. Trailers and semi-trailers with an all up weight that exceeds 19,000 kg.
  3. It is obligatory to install an independent brake on every trailer and semi-trailer, regardless of weight.
  4. Trailers and semi-trailers with an all up weight that exceeds 3,000 kg.