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Difficulty: HardTire Failure and Blowouts

If a commercial motor vehicle experiences a sudden steer-axle tire blowout at highway speed, the driver should immediately depress the clutch pedal and apply moderate service brake pressure to counteract asymmetric drag and stabilize directional control.

Answer: Answer

Answer

False
The statement is false because commercial driving safety standards mandate that an operator must never brake or depress the clutch immediately following a tire blowout. Doing so pitches vehicle weight onto the compromised steer tire, drastically amplifying lateral pull and risking a loss of vehicle control. The operator must hold the steering wheel firmly, stay off the brake, and let the vehicle coast to a safe deceleration speed before applying gentle braking.

Step-by-Step Solution

1
Analyze the physical forces generated during a steer-axle blowout.
A blown steer tire creates massive rolling resistance and drag on that specific side, pulling the vehicle heavily toward the blown tire.
Understanding the asymmetric drag explains why maintaining steering stability is the primary immediate emergency priority.
2
Evaluate the effect of applying the service brakes or depressing the clutch.
Braking shifts the vehicle's dynamic weight forward onto the collapsed tire and unweighted rims, which sharply intensifies the directional pull, risks wheel lockup, and can wrench the steering wheel from the driver's hands.
Commercial driver regulations explicitly forbid braking immediately following a tire blowout for this reason.
3
Identify the mandatory CDL emergency response procedure.
The driver must maintain a firm two-handed grip on the steering wheel, stay completely off the brake pedal, remain in gear to allow rolling resistance and engine compression to decelerate the vehicle, and only brake gently once the vehicle has slowed substantially.
This establishes that the proposed action in the statement directly contradicts required commercial driving safety protocols.

Key Concept

Emergency vehicle handling and braking prohibition during steer-axle tire blowouts
Estimated Time:1m 0s
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Topics

Tire Failure and Blowouts

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