Discussion
Which feature makes an air brake system fail safe?
Answer: A
The parking and emergency brake is held off by air pressure, so a loss of pressure applies it automatically. Reservoirs and warning devices are valuable but do not make the system fail safe. The spring brake is the key provision. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Checking which component actually carries the load settles most questions of this kind at once. Naming what changes and what stays the same is the reliable route through questions of this shape.
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