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Pyrolytic gas chromatography (PGC) has been applied to the characterization of the organic constituents of brake linings. The test involves the pyrolysis of a sample followed by the instrumental separation and sensing of the products of decomposition. A study of experimental variables, such as pyrolysis temperature, has allowed the selection of conditions which yield excellent reproducibility and sensitivity. The preferred test conditions, which have been incorporated in Ford's brake lining quality control specifications, result in a relatively rapid, meaningful test for constancy of composition.