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Washington CDL Practice 4

Practice 4 for CDL Exam learners in Washington: 25 questions, explained answers, and a review routine.

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Question 1

1

What is the main function of an air compressor in an air brake system?

Question 2

2

What is the purpose of the air storage tanks (reservoirs) in an air brake system?

Question 3

3

Why should air tanks be drained regularly?

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