Friction, wear and airborne particle emission from Cu-free brake materials

Yezhe Lyu, Mara Leonardi, Jens Wahlström, Stefano Gialanella, Ulf Olofsson

Research output: Contribution to journalArticlepeer-review

34 Citations (SciVal)


Cu is required to be abated in brake pads due to its toxicity. There are on the market several Cu-free brake pads. These Cu-free brake pads are only evaluated regarding their friction and wear performance, whereas, their airborne particle emissions are not considered. A pin-on-disc tribometer is used to evaluate the friction, wear and airborne particle emission from two Cu-free commercial brake pads used in the Europe. Moreover, a commercial brake pad containing Cu is evaluated as a reference. The results indicate that Cu-free brake pads yield comparable coefficient of friction as the Cu-contained brake pad. All three brake materials result in similar wear to the mating brake rotor. Cu-free brake pads generate more airborne particles than Cu-contained brake pad.

Original languageEnglish
Article number105959
JournalTribology International
Publication statusPublished - 2020 Jan 1
Externally publishedYes

Subject classification (UKÄ)

  • Tribology


  • Cu-free brake pad
  • Friction material
  • Particles
  • Wear


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