#### thornclaw

##### Well-Known Member

- Joined
- Mar 24, 2020

- Messages
- 51

- Reaction score
- 37

- Location
- northbrook, il

- Vehicle(s)
- 2015 mustang gt

- Thread starter
- #1

hello

there has been some concern about what happens to brake bias if you upgrade the 4 piston 14" factory gt brakes to the 6 piston 15" brembos. using some info from other posts i managed to come up with a calculation. the force applied to the pad via the caliper piston is the piston area x brake fluid psi. example: if you had 1 in squared piston area and applied 10 psi of brake fluid pressure you would have 10 pounds of force applied to the pad (10 psi x 1). if you had 2 inch squared of piston area and applied the same 10 psi of brake fluid pressure you would have 10 x 2= 20 pounds of force applied to the pad. the piston area of the brembos as measured by another forum member is 4.7% less than the factory gt brakes, meaning you would have 4.7% less total force applied to the pads. However, the rotor diameter is one inch larger, meaning the torque is increased by roughly 7% thereby increasing your overall braking force. the net result should be an increase, albeit small, of bias to the FRONT brakes. Other members feel free to check my math.

there has been some concern about what happens to brake bias if you upgrade the 4 piston 14" factory gt brakes to the 6 piston 15" brembos. using some info from other posts i managed to come up with a calculation. the force applied to the pad via the caliper piston is the piston area x brake fluid psi. example: if you had 1 in squared piston area and applied 10 psi of brake fluid pressure you would have 10 pounds of force applied to the pad (10 psi x 1). if you had 2 inch squared of piston area and applied the same 10 psi of brake fluid pressure you would have 10 x 2= 20 pounds of force applied to the pad. the piston area of the brembos as measured by another forum member is 4.7% less than the factory gt brakes, meaning you would have 4.7% less total force applied to the pads. However, the rotor diameter is one inch larger, meaning the torque is increased by roughly 7% thereby increasing your overall braking force. the net result should be an increase, albeit small, of bias to the FRONT brakes. Other members feel free to check my math.

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