Brake Bias Calculator

Inputs

Front line pressure (P_f)

Hydraulic pressure at the front calipers.

bar

Rear line pressure (P_r)

Hydraulic pressure at the rear calipers after any proportioning valve.

bar

Front piston diameter (d_f)

Diameter of one piston on one side of the front caliper.

Front pistons per side (n_f)

Number of pistons on one side of one front caliper.

Rear piston diameter (d_r)

Diameter of one piston on one side of the rear caliper.

Rear pistons per side (n_r)

Number of pistons on one side of one rear caliper.

Front pad friction (mu_f)

Effective pad coefficient of friction.

Rear pad friction (mu_r)

Effective rear pad coefficient of friction.

Front effective radius (R_f)

Effective rotor friction radius at the front.

Rear effective radius (R_r)

Effective rotor friction radius at the rear.

Front tire radius (r_f)

Rolling radius used to convert torque into tire contact force.

Rear tire radius (r_r)

Rear rolling tire radius.

Default result

Front brake bias

83.6%

Caution

Also computed

Front axle brake force10,410N

2,341 lbf

Rear axle brake force2,045N

459.7 lbf

Front wheel torque1,718N·m

Rear wheel torque337.4N·m

Method notes 2 notes

Bias is based on calculated axle tire-contact brake force, assuming the same hardware on left and right sides.
Real brake balance also depends on weight transfer, tire grip, tire diameter, pad temperature, ABS/EBD, proportioning valve curves and suspension geometry.