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When starting a vehicle with dual air brakes, pressure of ____ should be built up in the system before it is driven

A 100 psi
Explaination
Before driving a vehicle with a dual air brake system, allow time for the air compressor to build up pressure of at least 100 psi in both the primary and secondary systems. more
B 10 psi
C 25 psi
D 200 psi