2/32" is the industry standard for minimum brake thickness. This converts to about 1.6mm. 3mm is significantly before replacement is necessary, but you should also consider that you may be below minimum prior to your next
3k service.
Pad thickness does not affect the amount of heat transferred to the rotors. Braking systems are very efficient, and, if I recall the figure correctly, convert about 99% of a vehicle's kinetic energy to heat. In other words, the amount of heat resulting from a stop is dependent solely upon your vehicle's mass, speed, and rotational inertia.
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