Effect of graphite based solid lubricant on noise and braking performance in polymer composite brake friction materials

Purpose This study aims to investigate and evaluate the effects of graphite, used at different ratios as a solid lubricant in brake pads, on both braking/wear performance, a traditional focus, and braking noise, a crucial comfort criterion. Design/methodology/approach In this study, brake pad samples containing graphite at different weight ratios (5%, 10%, 15% and 20%) were developed. The physical properties of these samples were determined. Tribological performance (friction coefficient and wear loss) was determined following the ASTM G99 standard at 50 N load and 10,800 m sliding distance. Sound levels generated during braking were measured in decibels (dB). To investigate the wear mechanisms and surface…