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Question
Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.
Answers
A.  25 psi
B.  50 psi
C.  75 psi
D.  100 psi
Explanation
Before driving a vehicle with a dual air brake system, you should wait for the air compressor to build up at least 100 psi in both the primary and secondary systems.
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This questions is considered quite Hard

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