Wear depends on the conditions of friction and the state of friction. Bahan geseran kebanyakannya dalam bentuk geseran kering, dan keadaan geseran ini tanpa pelinciran adalah keadaan yang keras untuk pasangan geseran, yang tidak dapat dielakkan menyebabkan memakai dan meningkatkan jurang yang sepadan, dan mempengaruhi prestasi brek. And under normal circumstances, the wear of the friction pair is uneven wear, and the wear gap caused by all wear is also uneven, which is prominent on the drum brake. The non-uniformity of friction changes the distribution of brake pressure and increases the non-uniform wear of friction pairs. In addition, the friction heating of the braking process and the dust of the operating environment into the friction pair will cause the process of driving wear, which is thermal wear, abrasive wear, adhesive wear, fatigue wear and so on play a role at the same time, that is, wear is inevitable. Walau bagaimanapun, jumlah dan kelajuan haus boleh dikawal, kerana kelajuan haus bergantung pada bilangan dan kekerapan penggunaan, intensiti penggunaan, persekitaran penggunaan dan tahap penggunaan.