Does a truck's load affect its braking distance?

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A truck's load significantly impacts its braking distance, with heavier loads generally resulting in longer stopping distances due to increased mass affecting the force of friction and braking efficiency. The discussion highlights that while theoretical models may suggest braking force is independent of load, real-world factors such as tire load sensitivity and road conditions complicate this relationship. In practice, the coefficient of friction can decrease with increased load, potentially lengthening stopping distances, although some trucks may be designed to perform better when loaded. Additionally, factors like weight distribution and road conditions, such as mud or snow, can further influence braking performance. Overall, while a loaded truck typically takes longer to stop, various external factors must be considered for a comprehensive understanding.
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I still don't believe it's as clear-cut as “loaded truck = longer to stop”. There at many factors at play, there are many road conditions, and there are many trucks.

For example, what if the road is very muddy or very snowy? I’d venture to say that a truck which is too light will be more prone to hydroplaning or sliding.

Even in ideal conditions, it’s not a reach to say that the truck could be designed to perform better with a load than without one. The suspension settings or brake bias could be set up to provide better grip when loaded.
 

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