Brake Torque Calculator
SI
Imp
Imperial
Inputs
View results
Line pressure
(P)
Hydraulic brake line pressure.
psi
Piston diameter
(d)
Diameter of each caliper piston.
in
Pistons per side
(n)
Number of active pistons on one side of the rotor. Floating calipers can be represented by the piston count on the active side.
Pad friction coefficient
(mu)
Effective pad friction coefficient.
Effective rotor radius
(r_b)
Effective friction radius from rotor center to pad force centroid.
in
Tire rolling radius
(r_t)
Rolling radius used to convert brake torque into tire contact force.
in
Results
Default result
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Brake torque
(T_b)
1,113
lbf·ft
Pass
Also computed
Caliper clamp force
(F_c)
7,069
lbf
7,069 lbf
Tire contact force
(F_t)
1,028
lbf
1,028 lbf
Piston area, one side
3.534
in²
Method notes
2 notes
Clamp force is modeled as 2 * line pressure * total piston area on one side of the rotor.
Real brake performance also depends on pedal ratio, master cylinder, booster, bias, tire grip, pad temperature, ABS, rotor heat capacity and dynamic weight transfer.
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