ASE A4 Suspension and SteeringWheels and Tires Diagnosis and RepairMedium
A technician is performing a wheel inspection and notices corrosion buildup on the hub mounting surface. The technician should advise the customer that this condition can lead to:
- AA vibration that can be felt at various speeds
- BPremature tire wear
- CIncreased stopping distance
- DDifficulty in balancing the wheels
Show answer & explanationAnswer & explanation
Correct answer: A. A vibration that can be felt at various speeds
Corrosion buildup on the hub mounting surface prevents the wheel from sitting perfectly flat against the hub. This can cause the wheel to be slightly off-center or to wobble, leading to a vibration that can be felt throughout the vehicle, often at various speeds.
Why the other options are wrong
- B. While vibrations can indirectly affect tire wear over time, this is not the primary and most direct symptom.
- C. Increased stopping distance is typically related to brake system issues, not hub corrosion.
- D. Corrosion on the hub affects how the wheel mounts, not necessarily the ability to balance the wheel itself on a balancing machine.
Hub Mounting Surface Cleanliness
Corrosion or debris on the hub mounting surface prevents the wheel from seating flush, causing runout and imbalance, which manifests as vibration.
- Wheel must sit perfectly flat against the hub.
- Corrosion or debris creates an uneven surface.
- Leads to wheel runout and dynamic imbalance.
- Primary symptom is vibration, especially at speed.
Memory trick: Corrosion on the hub makes the wheel wobble and hum.