The wheel hub assembly is responsible for attaching the wheels to the vehicle and is a pre-assembled unit with precision bearings, seals and sensors. Also known as a wheel bearing, hub assembly, wheel unit or hub and bearing assembly, the wheel hub assembly is an important part of the steering system and contributes to the safe steering and handling of the vehicle.
At each wheel, you will find the hub assembly between the drive shaft and the brake drum or disc. On the disc side, the wheel is attached to the bolts of the hub assembly. On the driveshaft side, the hub assembly is mounted to the steering knuckle in the form of a bolt-on or press-in assembly.
To view the hub assembly you will need to remove the wheel and then remove the caliper and disc.
On most new vehicles produced since 1998, there is a hub assembly for each wheel. When the assembly deteriorates, remove it and replace it with a new one. On cars built before 1997, front-wheel drive vehicles use a hub assembly on each wheel, while rear-wheel drive vehicles use two separate bearings and seals on the two front wheels. Unlike hub assemblies, bearings can be repaired.
Firstly, the hub assembly secures your wheels to your vehicle and allows them to turn freely, enabling you to steer safely.
The hub assembly is also important for your anti-lock braking system (ABS) and traction control system (TCS). In addition to the bearings, the wheel hub assembly also contains the wheel speed sensors that control the vehicle's ABS braking system. The sensors constantly transmit the rotation speed of each wheel to the ABS control system. In an emergency braking situation, the system uses this information to determine whether anti-lock braking is required.
Your vehicle's traction control system also operates using the ABS wheel sensors. As an extension of the anti-lock braking system, the TCS system and the ABS system work together to help you maintain control of your vehicle. If this sensor fails, it can compromise your anti-lock braking system and traction control system.
Hubs are essential as they connect each wheel to the vehicle. Although they cannot be seen without removing the wheels, the vehicle would not be able to operate without them. The hubs enable the driver of the vehicle to move the wheels and steer.
If they are not working properly, this is when the driver may experience steering wheel alignment problems. If the hubs are not working correctly, the wheels may wobble and there will be too much friction on the wheels themselves.
The hub is responsible for attaching the wheel to the vehicle. It is therefore connected to the wheel and to the vehicle itself. The hub is attached to the vehicle's axle, which is located on the brake disc side of the chassis.
The tyres are then attached to the hub assembly with double-headed bolts. Given the location of the hub assembly behind the wheel, you will only be able to see it once you have removed the vehicle's wheels.
Wheel bearings and hub assemblies are essentially the same components. When it comes to the mechanics of a vehicle's wheels, there are many different names for similar components.
However, there are subtle differences between the two, which comes down to the way they are assembled. When looking at the wheel bearings, the mechanic can take them apart. This is great because it means that each component can be lubricated to ensure it works seamlessly.
In contrast, wheel bearings cannot be disassembled. If there are any problems with them, they need to be replaced, not repaired. These are issued by the manufacturer.
While they essentially do the same job, the difference lies in when there is a problem with the component. Wheel bearings and wheel hub assemblies are an important part of the vehicle as they are responsible for attaching and securing the wheels to the vehicle.
It is important to note that there are different types of hubs and bearings and they may vary depending on the vehicle you own. It is useful to know the differences.
Ball bearings - Ball bearings are one of the most common types. As the name implies, they are round balls made of metal. They are not usually used in wheel hubs because they are not strong enough. They can, however, be present in other parts of the vehicle.
Straight roller bearings - These bearings are cylindrical in shape. They are usually used in gearboxes and can handle heavier work. They can also handle thrust loads.
Tempered roller bearings - this type of bearing is also available in a cylindrical shape, but with one side tapered. They are particularly durable and long-lasting.
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