I guess I don't understand what you're describing.
Basically, an automotive disc brake is a device that converts the vehicle's kinetic energy into heat, via friction at the pad/rotor sliding contact. This friction heat is primarily transferred away from the pad/rotor contact interface via conduction in the pad and rotor structures, and not thru convection to the airflow. Since the pad is in intimate contact with the rotor surface when the heat load is being generated, there is very little potential for convective pad cooling at this point.
The conditions that exist at the pad/rotor interface, with the small area of the pad surface and the pad's low thermal conductivity, combined with the large area of the rotor's working surface and the rotor material's higher thermal conductivity, means that most of the conductive heat transfer takes place within the rotor, and not the pad.
With disc brakes, even after the brake caliper pressure is released, the clearance between the pad and rotor surface is still extremely small. And thus there is very little potential for cooling airflow thru this space. Most high performance disc brake calipers use extensive measures to thermally isolate the pad back plates and pistons. The piston/pad contact area is minimized, and piston materials with low thermal conductivity (such as titanium) are used.
If you have an overheating problem with your brake pads, the logical approach would be to:
A) Increase your pad contact surface area (ie. 6 piston calipers, or dual calipers per wheel). This would also necessitate higher caliper clamping forces.
B) Increase the conductive heat transfer rate away from the pad/rotor contact. This would require higher thermal conductivity in your pad and/or rotor materials.
C) Use rotor/pad materials with a higher thermal strength limit, such as CRC.
Finally, if you want to see an extreme example of how disc brake systems are designed to handle massive braking energies, take a look at a commercial aircraft disc brake system. Lots of rotor surfaces and lots of pad surface on each wheel.
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