After completing a continuous two-hour highway haul in mid-afternoon heat, a commercial operator performs an equipment check and finds that an outer drive tire is exceedingly hot to the touch, with internal pressure measured at 18 psi above the cold specification mark. Which of the following actions must the driver take?
- ADepress the tire valve pin to bleed off excess air pressure until the gauge matches the cold inflation recommendation.
- Keep the vehicle parked until the tire cools down naturally, leaving the built-up air pressure inside the tire untouched.Answer
- CApply hard service braking during immediate departure and douse the tire with cold water to rapidly contract the rubber.
- DResume highway travel with the auxiliary driveline retarder fully activated to dissipate wheel hub heat through drivetrain drag.
Answer
Keep the vehicle parked until the tire cools down naturally, leaving the built-up air pressure inside the tire untouched.
During hot weather driving, tire pressure increases naturally due to heat generated by road friction and high ambient temperatures. The CDL manual strictly states that drivers must never bleed air from hot tires because the tire will become dangerously underinflated when it cools down. If a tire is too hot to touch, the driver must remain stopped and allow the tire to cool down naturally before resuming travel to prevent a blowout or tire fire.
Step-by-Step Solution
Key Concept
Tire thermal expansion management and cooling protocols in hot weather driving
Estimated Time:1m 0s