Brake Line Pressure Calculator

Inputs

Pedal force (F_p)

Driver force applied at the brake pedal pad.

Pedal ratio (R_p)

Mechanical pedal leverage ratio.

Assist multiplier (A)

Use 1 for manual brakes. Add booster or hydraulic assist as an equivalent multiplier when known.

Master cylinder bore (d_m)

Master cylinder piston bore diameter.

Default result

Line pressure(P)

52.69bar

Pass

Also computed

Master cylinder force(F_m)2,670N

600.2 lbf

Master cylinder area(A_m)506.7mm²

Method notes 2 notes

Pressure is force divided by master cylinder piston area.
Real systems also need pedal travel, master volume, caliper volume, bias, booster curve, flex, fluid temperature and bleeding condition checks.