SEDL / STP / STP567-EB / STP32238S

A New Method for Testing Brake Lining Materials

Begelinger, A
Senior research associate and head of department, Metal Research Institute TNO, Apeldoorn, The Netherlands

de Gee, AWJ
Senior research associate and head of department, Metal Research Institute TNO, Apeldoorn, The Netherlands

Pages: 19    Published: Jan 1974

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Abstract

A new method for testing brake lining materials in the laboratory is described. This method is essentially isothermal by nature, thus avoiding the usual problems associated with differences between the heat-transfer characteristics of brake assemblies in road vehicles and those of laboratory test rigs. As an example of application of the method, friction-time-temperature curves of five different brake lining materials are presented and discussed in terms of time- and temperature-depending transformations in the composition of the lining materials.

The quality of the materials is described by the following properties: temperature range in which glazing effects occur; temperature range in which carbonization effects occur; steady-state value of the coefficient of friction; wear (decrease in thickness) of the lining; and sensitivity of the lining material to moisture.