Borax which is an important boron compound, a mineral, and a salt of boric acid, is used as a fire retardant and insulating material. The most important reac-tion in automobile brake systems is heat generation from friction. The heat gen-erated at the interface of disc and lining may cause deformation of the materials forming the lining. Therefore, phenomena such as lining wear and brake fade may be occurred. The aim of this study is to reveal the positive effects of borax additive on lining and experimentally examine the effect of grain size of borax on tribological properties. Lining is produced by mixing more than one powder materials and pressing cold and hot. The size and homogeneous mixture of pow-der materials affect the braking performance. In this study, the effect of using nano and micro sized borax with the same content on the lining performance was investigated. The produced linings were tested on pin-on disc tester. Wear, hard-ness and density tests were performed. The change in the friction coefficient was observed due to the temperature increase. The friction coefficient of the nano-containing lining showed a more stable result depending on the temperature.