Practice question

Why should air brakes be checked by procedure rather than by memory of one pressure number?

The system has several separate safety functions: buildup, leaks, warnings, spring brakes, and service brake action
Only one gauge matters in every vehicle
All air brake systems are identical in every detail
Pressure numbers are never tested

Answer: A — The system has several separate safety functions: buildup, leaks, warnings, spring brakes, and service brake action

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