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Difficulty: EasyTire Failure and Blowouts

When a commercial vehicle suffers a sudden tire blowout, what is the primary danger of applying the service brakes immediately?

  1. A
    It will damage the electronic stability sensors and prevent the anti-lock braking system from functioning.
  2. It can cause severe vehicle pull, wheel lockup, and an uncontrollable skid or rollover.Answer
  3. C
    It rapidly drains the primary air reservoir before the vehicle can safely reach the shoulder.
  4. D
    It prevents the transmission from downshifting into lower gears to assist with engine retardation.

Answer

Immediate braking can cause severe vehicle pull, wheel lockup, and an uncontrollable skid or rollover.
When a tire suddenly deflates, asymmetrical drag forces already pull on the vehicle. Applying the service brakes exacerbates this imbalance, as the wheel with the flat tire cannot generate normal friction and may instantly lock up, pulling the vehicle sharply or throwing it into a jackknife or rollover. Drivers must hold the steering wheel firmly, stay off the brake, allow the vehicle to coast down, and only apply gentle braking when speed is sufficiently reduced.

Step-by-Step Solution

1
Analyze the physical forces acting on a commercial vehicle during a blowout
A blown tire produces substantial asymmetric drag, pulling the vehicle toward the damaged side.
Understanding the immediate vehicle dynamics is essential for choosing the correct recovery action.
2
Evaluate the effect of pressing the service brakes during active tire failure
Braking increases the directional imbalance and easily causes the deflated wheel to lock up, inducing an uncontrollable skid.
Drivers must understand why staying off the brake pedal is a mandatory safety rule.

Key Concept

Braking precautions and vehicle stability during a tire blowout
Estimated Time:45s
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Topics

Tire Failure and Blowouts

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