Brake Torque Calculator

Inputs

Line pressure (P)

Hydraulic brake line pressure.

bar

Piston diameter (d)

Diameter of each caliper piston.

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.

Tire rolling radius (r_t)

Rolling radius used to convert brake torque into tire contact force.

Default result

Brake torque(T_b)

1,509N·m

Pass

Also computed

Caliper clamp force(F_c)31,440N

7,069 lbf

Tire contact force(F_t)4,573N

1,028 lbf

Piston area, one side2,280mm²

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.