Monga ma brake rotors amapangidwa ndi chitsulo, mwachibadwa amachita dzimbiri ndipo akakumana ndi mchere monga mchere, dzimbiri (oxidization) zimakonda kufulumira.Izi zimakusiyani ndi rotor yowoneka yoyipa kwambiri.
Mwachilengedwe, makampani adayamba kuyang'ana njira zochepetsera dzimbiri la ma rotor.Njira imodzi inali yogwiritsira ntchito zokutira za Geomet pofuna kupewa dzimbiri.