DFFT Tires and Wheels

Question 1

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

Accepted Answer

Uneven tire pressure between the front tires

Answer

Rear tires with insufficient tread depth

Answer

Mismatched tire brands on the rear axle

Answer

Overinflated spare tire

Question 2

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

Accepted Answer

Toe misalignment

Answer

Incorrect tire pressure

Answer

Worn wheel bearings

Answer

Brake caliper drag

Question 3

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

Accepted Answer

Worn or damaged shock absorbers

Answer

Excessive toe-out on the rear axle

Answer

Overinflation of the tire

Answer

Bent wheel rim

Question 4

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

Accepted Answer

Wear concentrated on both outer edges of the tread

Answer

Wear concentrated in the center of the tread

Answer

Even wear across the full tread width

Answer

Feathered edges on the tread blocks

Question 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?

Accepted Answer

Wheel imbalance

Answer

Tire sidewall bulge

Answer

Incorrect tire size

Answer

Low tire pressure

Question 6

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

Accepted Answer

Replace the tire immediately as it is structurally compromised

Answer

Reduce tire pressure to relieve sidewall stress

Answer

Monitor the bulge and re-inspect at the next service

Answer

Rotate the tire to the rear axle to reduce load

Question 7

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

Accepted Answer

2/32 inch

Answer

4/32 inch

Answer

1/32 inch

Answer

3/32 inch