Nowadays, great emphasis is put on safety and reliability for machines and devices. One of the newer standards for safety of machines and devices is SIST EN ISO 13849-1. A more important topic in this standard is the determination of the mean time to failure of a component or an entire device. The objective for the task is to determine mean time to failure (MTTF) of the hydraulic brake valve. Valve is a key element in a braking system for heavy-duty machines. Since a valve is also a safety part of the control system, its potential failure will result in a hazardous situation for people. Therefore it is necessary to prove analytically and experimentally the useful time of the brake valve. A sustainable test was carried out. After 1000 hours of testing, the test was stopped and the mean time to failure of the valve was calculated. None of the valves failed during testing.
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