monstar
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I found sizing is still related to both temperature management and torque management. Required torque of the brake is still governed by the weight distribution, and brake must still deliver torque as a product of rotor diameter and caliper piston size.Hi
Well I must be showing my age, I always thought the fronts should be larger than the rears.
Regards,
RTSV6UTE
In Zeta for example rear brakes are required to provide less than 50% of the torque, this allows for a smaller caliper that in turn allows a larger rotor that allows more heat dissipation to be packaged in the wheel.
Also more RWD cars are using larger rotors in the rear than in the front because rear brakes also play a larger role in electronic stability control and torque vectoring in addition to traction control.
All these features including automatic brake force distribution don't require the same clamping force as pure braking to a full stop, which is why you don't need the giant caliper.
Seems modern practice is to use the biggest rotor you can fit and then pick a caliper size to deliver the overall required torque. It is common to see larger rear rotor diameter due to this.