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Before driving a vehicle with a dual air brake system, you must let the pressure build up to at least ___ psi in both the primary and secondary systems.

100. Section 5.2: Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of 100 psi

Before driving a vehicle with a dual air brake system, you must let the pressure build up to at least ___ psi in both the primary and secondary systems.