| Summary: | This article explored the potential of cement bypass dust, a waste produced during cement manufacturing, as filler in automotive brake friction composites. Five different cement bypass dust particles (10–25, 88–105, 210–250, 354–400 and 600–700 µm) were used to manufacture non-asbestos/non-copper type friction materials. The composite's tribological properties were obtained from a chase friction testing machine. Maximum friction, fade, and recovery coefficients improve, whereas friction fluctuations and wear resistance of the brake friction composites decrease with cement bypass dust particle size. The worn surface morphology revealed that the cement bypass dust particle size played a considerable role in forming the contact plateaus and deciding the wear behaviour. Multi-objective optimization based on the ratio analysis approach was utilized to determine the composite's performance ranking.
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