ASE G1 Auto Maintenance and Light RepairSuspension and SteeringEasy
A vehicle exhibits a vibration that is felt primarily in the steering wheel, and it becomes more pronounced at highway speeds (e.g., 50-70 mph). The vibration smooths out at lower speeds. What is the MOST likely cause?
- AUnbalanced front wheels
- BUnbalanced rear wheels
- CSeverely worn shock absorbers
- DWorn universal joint (U-joint)
Show answer & explanationAnswer & explanation
Correct answer: A. Unbalanced front wheels
Vibrations felt in the steering wheel, especially at highway speeds, are typically caused by an imbalance in the front wheels. Rear wheel imbalances are usually felt in the seat or floorboard.
Why the other options are wrong
- B. Unbalanced rear wheels usually cause vibrations felt in the seat or floor, not primarily the steering wheel.
- C. Severely worn shock absorbers can cause a bouncy ride and uneven tire wear, but not typically a high-speed steering wheel vibration that smooths out at lower speeds.
- D. A worn U-joint in the driveshaft would typically cause a vibration felt throughout the vehicle, often under acceleration, not specifically in the steering wheel at highway speeds.
Wheel Imbalance Symptoms
Symptoms that indicate a wheel assembly (tire and rim) has an uneven distribution of weight.
- Front wheel imbalance: vibration in steering wheel
- Rear wheel imbalance: vibration in seat/floorboard
- Vibration often occurs at specific speed ranges
Memory trick: Steering = Front, Seat = Rear.