CDL General Knowledge Practice Test

Should you let air out of hot tires to normalize pressure?

True False Only if the pressure is too high Only if the tires appear to be bulging

Correct Answer:

False

Explanation:

Letting air out of hot tires to normalize pressure is not advisable. This is because tire pressure increases with heat due to the air inside expanding as the tires roll and generate friction. Adjusting the pressure while the tires are hot can lead to underinflation once the tires cool down, which can negatively affect handling, fuel efficiency, and overall tire wear. The best practice is to check the tire pressure when the tires are cold, which allows for an accurate reading. If the pressure is found to be consistently too high, it is better to wait until the tires have cooled before making any adjustments. This ensures that the tire maintains optimal performance and safety standards.

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