Brake Line Pressure Calculator
SI
Imp
Imperial
Inputs
View results
Pedal force
(F_p)
Driver force applied at the brake pedal pad.
lbf
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.
in
Results
Default result
Edit inputs
Line pressure
(P)
764.2
psi
Pass
Also computed
Master cylinder force
(F_m)
600.2
lbf
600.2 lbf
Master cylinder area
(A_m)
0.7854
in²
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.
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