Expressions for the temperature rise in drum and disc brakes are given for both single stops and regular repeated applications when cooling is taken into account. It is shown how these expressions enable the area of the braking path to be calculated if the temperature is not to exceed a specified value. The effect of the dimensions and the thermal properties of the brake components on the rate of temperature rise and on the limiting temperatures reached during a series of applications is discussed. Finally it is shown how random braking can be reduced to equivalent cyclic applications, and the braking area of a small sports car being driven in the Alps is calculated.
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