Correct answer
Airflow that helps dissipate heat.
Airflow through its ventilation design helps dissipate heat generated during braking. This does not mean it remains cold or that every disc is always cooler than every drum: design, load and use matter. Avoid overheating brakes and maintain the system.
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A property preventing any heating under all conditions.
A total absence of friction during braking.
Airflow that helps dissipate heat.
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