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Tires and Wheels Flashcards

7 cards from real DFFT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Tires and Wheels flashcards as text

  1. A driver reports that the vehicle pulls to the left during braking. Which tire-related fault is most likely responsible?

    Answer: Uneven tire pressure between the front tires

    Uneven tire pressure between the front tires causes one side to have more contact patch than the other, creating a pulling force during braking.

  2. What does a feathered or sawtooth wear pattern across the tread blocks of a tire typically indicate?

    Answer: Toe misalignment

    Feathered or sawtooth tread wear is a classic sign of toe misalignment, where the tires are angled inward (toe-in) or outward (toe-out) excessively.

  3. A technician finds cupping (scalloped) wear around the circumference of a rear tire. What is the most probable cause?

    Answer: Worn or damaged shock absorbers

    Cupping or scalloped wear is caused by worn shock absorbers that allow the tire to bounce and lose contact with the road, producing uneven wear patches.

  4. Which symptom would most likely indicate that a tire is significantly underinflated?

    Answer: Wear concentrated on both outer edges of the tread

    Underinflated tires flex excessively, causing the outer edges of the tread to bear more load than the center, producing wear on both shoulders.

  5. A driver complains of severe vibration felt through the steering wheel at highway speeds. The vibration disappears at low speeds. What is the most likely tire or wheel fault?

    Answer: Wheel imbalance

    Wheel imbalance causes a speed-dependent vibration that increases with vehicle speed because the out-of-balance mass creates a centrifugal force proportional to the square of rotational speed.

  6. During a tire inspection, a technician notices a bulge on the sidewall of a front tire. What action should be taken?

    Answer: Replace the tire immediately as it is structurally compromised

    A sidewall bulge indicates internal structural damage to the tire's carcass, which can lead to sudden blowout and must be replaced immediately.

  7. What is the minimum legal tread depth for passenger car tires in the United States?

    Answer: 2/32 inch

    The minimum legal tread depth for passenger car tires in the US is 2/32 of an inch, as measured in the principal grooves.