CDL Vehicle Combination Practice Test

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Prepare for the CDL Vehicle Combination Test. Access multiple choice questions, detailed answers, and hints to guide your study. Ace the exam with confidence!

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What is the purpose of locking tractor glad hands to each other when not in use?

To keep the glad hands warm
To keep dirt and water out of the air lines
To prevent the glad hands from breaking
To ensure they are easy to find

The correct answer is: To keep dirt and water out of the air lines

Locking tractor glad hands to each other when not in use primarily serves to keep dirt and water out of the air lines. This is crucial because the glad hands are responsible for connecting the air supply between the tractor and the trailer. Any contamination or moisture in the air lines can lead to malfunctioning brakes or other pneumatic systems, which can compromise safety on the road. By securing them together, you effectively block any environmental contaminants from entering, thus maintaining the integrity and functionality of the air system. While other options discuss potential benefits like warmth or accessibility, the key purpose is the prevention of foreign materials entering the air lines, which is fundamental for ensuring reliable operation and safety.