ASE A4 Suspension and SteeringWheels and Tires Diagnosis and RepairHard
A client complains that their vehicle pulls to the right and they observe uneven wear on the outer shoulder of the left front tire and the inner shoulder of the right front tire. Which alignment angle is MOST likely out of specification?
- AToe-out
- BCaster
- CToe-in
- DCamber
Show answer & explanationAnswer & explanation
Correct answer: A. Toe-out
A pull to the right combined with outer shoulder wear on the left front tire and inner shoulder wear on the right front tire indicates excessive toe-out. Toe-out means the front of the wheels are pointing away from each other, causing the tires to scrub sideways.
Why the other options are wrong
- B. Caster primarily affects steering returnability and stability, not typically causing this specific wear pattern or pull.
- C. Excessive toe-in would cause wear on the inner shoulders of both front tires and potentially a pull to one side or wandering.
- D. Camber issues typically cause wear on one side of the tire (inner or outer) but usually don't cause a pull in this specific combination with the described wear.
Toe-out Wear Pattern
Excessive toe-out causes the front of the tires to point away from each other, leading to feathering or wear on the outer shoulder of one tire and the inner shoulder of the other, often accompanied by a pull.
- Front of tires point away from each other
- Causes tire scrubbing
- Wear on outer shoulder of one tire, inner shoulder of the other
- Can result in a pull or wandering
Memory trick: Toe-out spreads the wear, Camber leans the wear, Caster steers the car.