DFFT Tires and Wheels 2

Question 1

A vehicle exhibits excessive body lean during cornering and the tires show wear on the outer shoulders. Which fault best explains both symptoms?

Accepted Answer

Weak or worn front anti-roll bar (sway bar)

Answer

A worn anti-roll bar allows excessive body roll during cornering, loading the outer tires heavily and causing outer shoulder wear while also making the vehicle lean noticeably.

Question 2

When inspecting a set of tires, you notice that both rear tires show wear only on the inner edges. What alignment fault does this suggest?

Accepted Answer

Excessive negative camber at the rear

Answer

Excessive negative camber tilts the top of the wheel inward, placing more load on the inner edge of the tire and causing inner edge wear.

Question 3

A tire pressure monitoring system (TPMS) warning light illuminates while driving. What is the correct first action?

Accepted Answer

Stop safely and check all tire pressures with a calibrated gauge

Answer

The TPMS warning indicates a tire is at least 25% below the recommended pressure; the correct response is to stop safely and verify pressure with a gauge before continuing.

Question 4

What fault would most likely cause a rhythmic thumping noise that increases in frequency with vehicle speed and is felt through the floor at all speeds?

Accepted Answer

A flat spot on the tire from wheel lockup

Answer

Flat spots develop on tires after prolonged wheel lockup during emergency braking and create a rhythmic thump that matches tire rotation frequency.

Question 5

During a pre-drive inspection, a driver notices that one front tire appears lower than the others. Which of the following faults would cause a slow air leak from a tubeless tire?

Accepted Answer

All of the above

Answer

All three — a puncture from road debris, a cracked bead seat, and a degraded valve stem — are common causes of slow air loss from tubeless tires.

DFFT - Driver Fault Finding Test Practice Test

DFFT - Driver Fault Finding Test Practice Test

DFFT Tires and Wheels 2