What is the technical reason why disc brakes tend to overheat less than drum brakes?

Question

DentroTest · Accepted Answer

The correct answer is that they are well ventilated. Disc brakes consist of a rotating disc exposed to open air. When the pads press against the disc to brake, the heat generated by friction dissipates quickly thanks to constant airflow. In contrast, drum brakes are a closed system; heat accumulates inside the casing and takes longer to evacuate, increasing the risk of brake fade (loss of efficiency due to overheating). Analysis of incorrect options: The friction surface in drum brakes (shoes) is usually large, but this does not prevent overheating. Disc braking is generally more progressive and modulable, not more abrupt.

What is the technical reason why disc brakes tend to overheat less than drum brakes?

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