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If your vehicle has a properly functioning dual air brake system and minimum-sized air tanks, the air pressure should build from 85 to 100 psi within ____ seconds.

A 45
Explaination
In dual air systems with minimum-sized air tanks, the pressure should build from 85 to 100 psi within 45 seconds. (With larger air tanks, it can take longer. Check the manufacturer's specifications for the expected amount of time.) If it takes longer than it should, there may be a problem with your system that may cause you to lose air pressure while you're driving.
B 60
C 20