In the Final Master’s Thesis, the character of faults of principal systems in buses “Karosa B-741” exploited upon the conditions of JSC “Vilniaus autobusai” is analyzed and an assessment of technical service technologies by fault rate is provided. The regularities of frequencies of faults of the principal systems are searching, the causes of appearance of faults and dependence on seasons are cleared up. The technical service periodicity usable by the bus manufacturer and the enterprise engaged in bus exploitation are analyzed as well. In the Paper, the concept of technical exploitation and the ways of collection the data on exploitation reliability are presented. The system of technical service and the technological processes are described. Statistical processing of the distribution of the most frequent faults is carried out and their middle resource is found. Dependence on run of fault of the principal systems are analyzed; an assessment of the technical service periodicity is carried out. The conclusions from the Final Paper and proposals are provided. Taking into regularities of faults it‘s offering to estimate by correction of the bus manufacturer technical service periodicity, especially in cold season. The Paper includes: the introduction, four parts, conclusions and suggestions, the list of references. Thesis consist of: 101 text without extras, 33 figures, 18 tables, bibliographical entries. The annexes are enclosed hereto.