What to know
- This wear can lead to increased play in the bearing, resulting in a grinding or humming noise when the vehicle is in motion.
- A catastrophic wheel bearing failure can cause the wheel to detach from the vehicle, posing a serious safety hazard to both occupants and other road users.
- The vehicle owner will then be required to have the bearings repaired or replaced before the vehicle can pass the MOT and be deemed roadworthy.
Wheel bearings are crucial components of a vehicle’s suspension system, ensuring smooth and safe operation. During an MOT test, inspectors thoroughly examine these bearings for any signs of damage or wear that could compromise their functionality. This blog post will delve into the intricacies of wheel bearing MOT failure, exploring its causes, symptoms, and implications for vehicle safety and roadworthiness.
Causes of Wheel Bearing MOT Failure
1. Excessive Wear and Tear:
Over time, wheel bearings can wear down due to constant friction and stress. This wear can lead to increased play in the bearing, resulting in a grinding or humming noise when the vehicle is in motion.
2. Contamination and Corrosion:
Dirt, water, and other contaminants can enter the bearing assembly, causing corrosion and premature wear. Corrosion can weaken the bearing’s components, leading to failure.
3. Poor Maintenance:
Neglecting regular lubrication or failing to replace worn bearings can accelerate their deterioration. Proper maintenance is essential for extending the lifespan of wheel bearings.
Symptoms of Wheel Bearing MOT Failure
1. Grinding or Humming Noises:
A grinding or humming noise that increases with speed is a common symptom of a failing wheel bearing. This noise is caused by the damaged bearing rubbing against other components.
2. Vibration in the Steering Wheel:
As the bearing becomes more worn, it can cause vibrations in the steering wheel, especially when driving on uneven surfaces or under load.
3. Uneven Tire Wear:
A damaged wheel bearing can cause the wheel to wobble, resulting in uneven tire wear. This can lead to premature tire replacements.
Implications of Wheel Bearing MOT Failure
1. Reduced Vehicle Stability:
Worn wheel bearings can compromise the vehicle’s stability, making it difficult to control, especially during cornering or emergency maneuvers.
2. Increased Braking Distance:
A failing wheel bearing can affect the braking system‘s performance, resulting in increased braking distances and reduced responsiveness.
3. Safety Hazard:
A catastrophic wheel bearing failure can cause the wheel to detach from the vehicle, posing a serious safety hazard to both occupants and other road users.
How Wheel Bearings Are Tested During an MOT
During an MOT test, inspectors will conduct a thorough visual and auditory examination of the wheel bearings. They will:
- Visually inspect the bearings for any signs of damage, corrosion, or excessive play.
- Check for any unusual noises or vibrations when the wheels are rotated.
- Apply pressure to the wheels to detect any excessive play or looseness.
What Happens If Wheel Bearings Fail an MOT?
If a wheel bearing fails an MOT test, the vehicle will be issued a failure notice. The inspector will provide a detailed report outlining the specific defects identified. The vehicle owner will then be required to have the bearings repaired or replaced before the vehicle can pass the MOT and be deemed roadworthy.
Consequences of Ignoring Wheel Bearing MOT Failure
Ignoring a wheel bearing MOT failure can have severe consequences, including:
- Reduced vehicle control and stability
- Increased risk of accidents
- Damage to other components, such as brakes and tires
- Potential for a catastrophic wheel bearing failure
Key Points: Prioritizing Wheel Bearing Maintenance
Wheel bearings play a vital role in vehicle safety and performance. Regular maintenance and prompt attention to any symptoms of failure are crucial for ensuring the longevity and reliability of the vehicle. By understanding the causes, symptoms, and implications of wheel bearing MOT failure, vehicle owners can make informed decisions to maintain their vehicles in optimal condition.
Information You Need to Know
1. How often should I have my wheel bearings checked?
It is recommended to have your wheel bearings checked regularly, typically every 12,000 to 15,000 miles or as recommended by your vehicle’s manufacturer.
2. Can I replace wheel bearings myself?
Replacing wheel bearings can be a complex task that requires specialized tools and knowledge. It is generally recommended to leave this repair to a qualified mechanic.
3. How much does it cost to replace wheel bearings?
The cost of replacing wheel bearings varies depending on the vehicle model and the extent of the damage. Generally, the cost can range from $200 to $600 per wheel.