Venting Vanes
Many rotors do have air paths that cool them, but they're found sandwiched inside the rotor discs themselves. This rotor cutaway from StopTech shows vanes that actually pump air from the hub outward. Rotors with these types of cooling vanes are directional, since the pumping action only works when the rotor is turning in one direction. Mixing up the left- and right-side rotors will negate the pumping action. View Related Article
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