Discussion
Which design feature improves disc brake cooling?
Answer: B
Vanes between the two friction faces pump air through the disc and greatly increase the convective cooling. Drilling helps gas escape and looks purposeful but removes cooling mass and can crack. Ventilation is the effective measure. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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