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Difficulty: EasyTire Failure and Blowouts

While driving on a level roadway, a driver notices a rapid thumping sound accompanied by rear-end vibration and fishtailing, while the steering wheel remains easy to turn. Which mechanical problem do these symptoms indicate?

  1. A
    A steer axle tire failure, which primarily produces violent pulling and heavy resistance in the steering wheel.
  2. A rear or trailer tire failure, which typically generates heavy vibrations and tail fishtailing without affecting steering wheel feel.Answer
  3. C
    Excessive steering box free play, which causes erratic wheel tracking without generating rear chassis sway.
  4. D
    Sudden service brake pushrod overextension, which leads to total pedal fade rather than rhythmic rear body sway.

Answer

A rear or trailer tire failure, which typically generates heavy vibrations and tail fishtailing without affecting steering wheel feel.
Rear tire blowouts or rapid deflations cause noticeable thumping, vibrations through the chassis, and rear fishtailing, while the steering wheel continues to turn normally.

Step-by-Step Solution

1
Analyze the physical symptoms reported during operation: thumping noise, chassis vibration, rear fishtailing, and normal steering feel.
Identify that the vehicle's directional control at the front axle remains unaffected while the rear loses stability.
Front tire failures directly pull the steering mechanism, whereas rear tire failures manifest primarily through vibration and rear sway.
2
Match the observed behavior to commercial vehicle failure characteristics.
Confirm that rear fishtailing accompanied by chassis vibration without steering pull indicates a rear dual or trailer tire failure.
Correct identification of the failure location helps the driver respond calmly by maintaining a firm grip and coasting to a safe stop without overreacting.

Key Concept

Distinguishing between front steer tire failure symptoms (heavy steering pull) and rear tire failure symptoms (chassis vibration and fishtailing).
Estimated Time:45s
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Topics

Tire Failure and Blowouts

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