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Brake drums are typically made from cast iron due to its strength, durability, and thermal conductivity. They are designed to withstand the extreme conditions associated with heavy braking, such as high temperatures and significant wear and tear. Over time, however, brake drums can become warped or worn, leading to reduced braking efficiency.
semi truck brake drum

In contrast, drum brakes utilize a cylindrical drum that rotates with the wheel. When activated, brake shoes inside the drum expand against its inner surface, creating friction to slow the vehicle down. Drum brakes are generally more compact and cost-effective to manufacture, which is why they’re often found in the rear brakes of economy vehicles. However, they tend to perform less effectively in adverse weather conditions and can suffer from brake fade during prolonged use due to overheating.
disc or drum brakes better

L'évaluation de la performance des tambours de frein peut se faire via différents critères. L'un des plus importants est la capacité de dissipation thermique. Lorsqu'un véhicule freine, une quantité considérable de chaleur est générée par la friction. Si cette chaleur n'est pas correctement dissipée, les performances de freinage peuvent diminuer, ce qui peut entraîner un effet de « fade » (affaiblissement) du frein, diminuant ainsi l’efficacité globale du système. Un tambour bien conçu doit donc être capable de gérer cette chaleur de manière efficace.
scored brake drums
