DFFT Steering and Suspension

Question 1

A vehicle wanders excessively on the highway and requires constant steering corrections. What is the most likely cause?

Accepted Answer

Worn tie rod ends causing excessive play in the steering

Answer

Worn tie rod ends create looseness in the steering linkage, allowing the front wheels to wander rather than tracking in a straight line.

Question 2

A vehicle pulls to the left when the driver releases the steering wheel. What is the most likely alignment fault?

Accepted Answer

More positive camber on the right front wheel than the left

Answer

A vehicle with unequal camber will pull toward the side with the most positive camber because that wheel generates more lateral force.

Question 3

A customer reports a clunking noise from the front suspension when driving over bumps. What should be inspected first?

Accepted Answer

Sway bar end links and bushings

Answer

Sway bar end links and bushings are common sources of clunking over bumps because they connect the sway bar to the suspension and can wear or loosen over time.

Question 4

Excessive tire wear on the outer edges of both front tires is present. What alignment angle is most likely out of specification?

Accepted Answer

Excessive positive camber on both front wheels

Answer

Excessive positive camber tilts the top of the tire outward, putting more load on the outer tread edge and causing it to wear faster than the inner edge.

Question 5

What is the purpose of the caster angle in a vehicle's front suspension alignment?

Accepted Answer

To provide steering returnability and straight-line stability

Answer

Caster creates a mechanical trail that causes the front wheels to self-center after a turn and resist deflection from road imperfections, promoting straight-line stability.

DFFT - Driver Fault Finding Test Practice Test

DFFT - Driver Fault Finding Test Practice Test

DFFT Steering and Suspension