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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

One of the primary consequences of operating with a brake drum that is below its minimum thickness is overheating. As the drum wears down, it may not dissipate heat efficiently, which can cause the brakes to overheat. Overheating can lead to brake fade, where the effectiveness of the brakes diminishes significantly, making it harder to stop the vehicle. This can be particularly dangerous in emergency situations where rapid stopping is necessary.
minimum brake drum thickness
