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Abstract
The hydraulic-compressed air brake system has a very complex structure and is often equipped on heavy trucks. The reliability and technical states of the brake system have a significant influence on the vehicle's safety of movement and controllability. Therefore, it is essential to study and evaluate the technical conditions of the entire brake system, each cluster and element. This paper presents the theoretical basis for building a Markov model based on the analysis of structural characteristics of the hydraulic-compressed air brake system to assess the technical status of both the design and its components. Based on the input parameters that are the failure frequency statistics from actual units, the output results are the reliability and the reliability decline rules of both the system and the elements. The survey results can help optimize spare parts management, change the technical impact cycle, and propose solutions to improve maintenance and repair work efficiency.