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The present paper addresses an investigation about the definition of a parameter for quantifying the creep-groan propensity in brake pads. Creep-groan is a self-excited vibration caused by stick-slip phenomenon [1, 2, 3]. For the definition of the creep-groan propensity parameter, extensive experimental work was performed on a laboratory-scale tribometer. The experiments are divided in two main parts: (i) study of correlation between accelerometer signal with physical and operating parameters. (ii) validation of the chosen parameter, which was based on stick-slip tests performed with three different materials, one low-metallic (low-met) and two non-asbestos organic (NAO 1 and 2). From the first study, it was found that both the slip power and mean torque multiplied by torque variation showed a slightly higher correlation with the acceleration signal.

The current paper addresses the comparative analysis of the performance (friction and wear) produced by original and aftermarket brake pads. The brake pads selected in this study belongs to a large circulation vehicle in Brazil, which also has a high number of sales. An original and 4 others aftermarket brake pads were purchased at Porto Alegre, Brazil. The braking tests were performed on a braking tribometer, which is located on the University facilities. Experimental data of the coefficient of friction produced by each brake pad have been recorded. A precision scale was used to measure the mass loss of the materials subjected to the tests. Results of the performance obtained by the brake pads are evaluated and discussed in this paper. Results have shown that the original brake pad has superior properties in terms of friction performance (magnitude and variation), while aftermarket 1 and aftermaket 2 materials have the lowest vibration magnitudes.