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EXAM REVIEW
NCCCO Examination
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Ihuman Case Study
LETRS
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2026 Free California DMV Combination Class A CDL Test 1
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Question Number 1
1. A loss of air pressure in the emergency line will cause:
The suspension springs to extend.
The tractor protection valve to open.
The emergency brakes to activate.
✔ Correct Answer:
The emergency brakes to activate.
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