Reliability analysis of an automotive car braking system using logic diagram technique

In this study, efforts have been made to determine the reliability of an automotive car braking system using the logic diagram technique. The braking system consists of two subsystems: fluid braking and mechanical braking, which are connected in parallel. The fluid braking subsystem includes a master cylinder unit and a wheel braking unit connected in series. The master cylinder unit comprises a single component, while the wheel braking unit has a parallel-series configuration of order (4, 2). The mechanical braking subsystem consists of a cable unit and a brake shoes unit connected in series. The cable unit contains a single component, and the brake shoes unit consists of two brake shoes connected in parallel. Expressions for reliability and mean time to system failure (MTSF) are derived by accounting for both identical and non-identical components, assuming failure rates follow a negative exponential distribution. The sensitivity analysis has been carried out to investigate the overall system reliability by changing the parameter values of the different components and identify the critical components.