Commercial Driver License (CDL) Class B Practice Test

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Study for the Commercial Driver License (CDL) Class B Test. Study using multiple-choice questions, hints, and explanations. Prepare for your exam effectively!

Practice this question and more.

Should you let air out of hot tires to return them to normal pressure?

Yes, it helps to cool them down
No, it will be too low when they cool off
Only if the tire is extremely hot
It's acceptable if the vehicle is stationary

The correct answer is: No, it will be too low when they cool off

The appropriate action when dealing with hot tires is to refrain from letting air out to reduce pressure. When tires heat up during driving, the air inside expands, which causes the pressure to rise. If you were to release some of this air when the tires are hot, the pressure could fall to an inadequate level once they cool down. This can lead to under-inflation, which negatively impacts handling, tire wear, and overall vehicle safety. Maintaining proper tire pressure at all times is crucial for optimal vehicle performance, and it’s advisable to check the pressure when the tires are cold for the most accurate reading.