Question 1375 in the bank

On which of the following commercial vehicles and work vehicles is it obligatory to have a compression brake (retarder)?

  1. On all of them, regardless of weight.
  2. Correct answer: On a vehicle weighing at 8,000 kg or more.
  3. On a vehicle weighing at least 12,000 kg.
  4. On a vehicle weighing weighing 4,500 kg or more.

Why this is the answer

The correct answer in the official bank: On a vehicle weighing at 8,000 kg or more.

A compression brake (retarder) is mandatory on commercial and work vehicles weighing 8,000 kg or more. On heavy vehicles, long braking with the service brakes alone, such as on a long downhill, overheats them and can weaken their effect. The retarder slows the vehicle using the engine and takes load off the brakes. 4,500 kg is too low a threshold, and 12,000 kg is higher than required.

Topic: Rules and regulations. The bank marks it for these classes: Light truck (C1), Heavy truck (C), Bus (D).