The present work discusses the tribological performance of friction composites reinforced by natural fibers at continuous and starting - stopping tests aiming to provide specific relationship between the performances of the two tests. In the friction composites, asbestos is replaced by the tested natural fibers such as corn, palm and sugar bars. The proposed composites contain a mixture of phenolic resin (as matrix), metal powder (iron, copper, and aluminum), graphite, barium sulfate, and silica. Friction coefficient, wear, and temperature were accurately measured for the two tests...