Wear depends on the conditions of friction and the state of friction. The friction material is mostly in the form of dry friction, and this friction condition without lubrication is a harsh condition for the friction pair, which will inevitably cause wear and increase the matching gap, and affect the braking performance. 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. Kajaba iku, pemanasan proses remaja lan bledug saka lingkungan operasi menyang pasangan gesekan bakal nyebabake proses nyandhang, yaiku nyandhang jarang, nyandhang kesusahan, nganggo peran ing same time, that is, wear is inevitable. Nanging, jumlah lan kacepetan nyandhang bisa dikendhaleni, amarga kacepetan nyandhang gumantung karo nomer lan frekuensi panggunaan, intensitas panggunaan, lingkungan panggunaan lan level panggunaan.