Vehicles with dual air brake systems:
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.
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This questions is considered quite Hard
This questions appears in the following tests:
Illinois Practice test 4
Massachusetts Practice test 15
New Jersey Practice test 3
North Dakota Practice test 14
North Dakota Practice test 16
South Dakota Practice test 15
West Virginia Practice test 3