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Question

Difficulty: HardTire Failure and Blowouts

After hearing a loud thud from underneath the chassis, the driver notes heavy vehicle vibration and a pronounced fishtailing sensation across the rear axle, while directional steering control remains stable. What is the correct operational procedure to handle this emergency safely?

  1. A
    Apply the service brakes with maximum pedal force immediately to minimize distance traveled before the damaged tire shreds completely.
  2. Hold the steering wheel firmly with both hands, keep off the brake pedal to let the vehicle coast down naturally, and pull smoothly off the road once speed has safely decreased.Answer
  3. C
    Activate the auxiliary engine retarder immediately to achieve rapid deceleration while steering sharply away from the swaying motion.
  4. D
    Perform repetitive snub braking by applying hard pressure down to five miles per hour below the posted speed limit, then releasing the pedal.

Answer

Hold the steering wheel firmly with both hands, keep off the brake pedal to let the vehicle coast down naturally, and pull smoothly off the road once speed has safely decreased.
When a commercial motor vehicle suffers a tire blowout, the immediate safety rule is to grip the steering wheel firmly, stay completely off the brakes, let the vehicle coast to scrub off speed, and only apply gentle braking to maneuver off the roadway once the vehicle has slowed down significantly.

Step-by-Step Solution

1
Diagnose the failure type based on physical symptoms.
Rear tire failure identified by vehicle vibration and fishtailing without severe steering pull.
Steer tire blowouts cause severe pull in the steering wheel toward the deflated tire, whereas rear/drive tire blowouts manifest as vibration, thumping, and rear-end swaying.
2
Maintain firm steering grip and avoid the brake pedal.
Vehicle maintains a straight trajectory while momentum dissipates.
Braking immediately after a blowout can lock up the compromised axle, causing catastrophic loss of control or a jackknife.
3
Allow the vehicle to coast down naturally and steer off the roadway when slow.
Safe, controlled stop on the shoulder or safe pull-off area.
Light, gentle braking is only safe once the vehicle has already decelerated substantially.

Key Concept

Tire Failure Diagnosis and Emergency Response Protocol
Estimated Time:1m 30s
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Topics

Tire Failure and Blowouts

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