Brake Heat Calculator

Inputs

Vehicle mass (m)

Vehicle mass or test weight.

Initial speed (v_i)

Speed before braking.

km/h

Final speed (v_f)

Speed after braking. Use zero for a stop.

km/h

Front brake bias (B_f)

Percentage of braking energy assigned to the front axle.

Front rotor mass each (m_f)

Mass of one front rotor.

Rear rotor mass each (m_r)

Mass of one rear rotor.

Rotor specific heat (c_p)

Cast iron is often near 450-500 J/(kg*C).

J/(kg*C)

Stop count (N)

Repeated equivalent stops without cooling.

Default result

Front rotor temp rise

51.32°C

Pass

Also computed

Rear rotor temp rise29.33°C

Total stop energy539.6kJ

Front rotor energy each188.9kJ

Rear rotor energy each80.94kJ

Method notes 2 notes

This is a lumped heat-capacity screen. It ignores pads, calipers, tires, air cooling, radiation, rotor vanes and heat rejection during the stop.
Use instrumented testing or manufacturer brake thermal data for final design and safety decisions.