Commercial Driver License (CDL) Class B Practice Test

True or False: Empty trucks have the best braking performance.

1. True

2. False

3. Only in dry conditions

4. Depends on truck model

The correct answer is: False

The assertion that empty trucks have the best braking performance is false. When a truck is fully loaded, the weight of the cargo adds momentum, and this can lead to increased braking efficiency due to the greater friction and stability provided by the added mass. Conversely, an empty truck can experience less effective braking. This is because, without the weight, there is less traction on the tires, increasing the likelihood of skidding and making it more challenging for the driver to control the vehicle during a stop. Additionally, factors like weight distribution play a significant role in braking performance. An empty truck may not have enough weight over the drive wheels, which can reduce the grip necessary for effective braking. Therefore, while the weight adds stopping power, it also contributes to better overall control in adverse conditions. An empty truck could be more susceptible to factors such as wind or road conditions, further diminishing its braking effectiveness compared to when it is fully loaded.