Which of the following commercial vehicles must be equipped with an auxiliary brake?
- Commercial vehicles with an all up weight exceeding 4,000 kg.
- Commercial vehicles with an all up weight exceeding 6,000 kg.
- Commercial vehicles with an all up weight exceeding 5,000 kg.
- Correct answer: Diesel-engine vehicles with an all up weight exceeding 8,000 kg.
Why this is the answer
The correct answer in the official bank: Diesel-engine vehicles with an all up weight exceeding 8,000 kg.
An auxiliary brake, such as an engine brake, slows the vehicle using engine resistance. This takes load off the service brakes on long descents and prevents them from overheating and fading. It is mandatory for diesel-engine vehicles with an all up weight over 8,000 kg. Lower weights such as 4,000 or 6,000 kg are not the threshold for this requirement.