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Brake Bias Calculator

Brake line pressure (psi)
Front
Piston 1 diameter (inch)
Piston 2 diameter (inch)
Piston 3 diameter (inch)
Rotor diameter (inch)
Pad radial width (inch)
Pad friction coeficient
Rear
Piston 1 diameter (inch)
Piston 2 diameter (inch)
Piston 3 diameter (inch)
Rotor diameter (inch)
Pad radial width (inch)
Pad friction coeficient
Results
Front brake torque (ft.lbs)
Rear brake torque (ft.lbs)
Brake bias

Unit converter

mm = inch

ft·lb = Nm



Table for known kits

* This is based on the info I collected online/offline, use at your own discretion

Front Rear Result
Car Kit Name Piston 1
diameter
(inch)
Piston 2
diameter
(inch)
Piston 3
diameter
(inch)
Rotor
diameter
(inch)
Pad
radial width
(inch)
Pad
Miu
Piston 1
diameter
(inch)
Piston 2
diameter
(inch)
Piston 3
diameter
(inch)
Rotor
diameter
(inch)
Pad
radial width
(inch)
Pad
Miu
Front torque
(ft.lbs)
Rear torque
(ft.lbs)
F/R Bias
Brz/86/FRS Gen1/Gen2 (non-brembo) OEM 1.685 1.685 0 11.575 2.0 0.5 1.5 0 0 11.42 1.36 0.5 0 0 0
Brz/86/FRS Gen1, GR86 RR-Racing Stage II + OE rear 1.62 1.12 1.12 12.8 1.75 0.5 1.5 0 0 11.42 1.36 0.5 0 0 0
Brz/86/FRS Gen1 AP Racing Sprint 1.5 1.626 0 11.77 1.75 0.5 1.5 0 0 11.42 1.36 0.5 0 0 0