In most of the Car's today the Wheel Bearings are located in the Wheel Hub Assembly that hold the Wheels to the vehicles axles and allow the Car Wheels to rotate freely. These are designed to support the weight of the vehicle and allow it to travel over the road with a minimum of rolling friction, the Wheel Bearings are designed to withstand the thrust loads generated by high speed cornering and hard acceleration and braking situations of your Car. Most modern vehicles use a one piece Hub Assembly that incorporates the Hub, Wheel Bearing, ABS Sensor, and mounting Flange. Some vehicles use a separate Wheel Hub and push Bearings unit as front Wheel Hub and Bearings are fitted on the end of the front Wheel Spindle such as between the Spindle and front Brake Rotor which holds the Brake Rotor and Wheel onto the vehicle.

The regular exposure to salt and sand spray from winter roads adds further stress to the Wheel Bearings. Some of the front wheel drive vehicles manufacturers have switched to sealed Ball Bearing/Hub Assemblies, which are non serviceable, instead of serviceable tapered roller Wheel Bearings which were utilized in rear Wheel drive vehicles before.

Worn out Car Wheel Bearings cause grinding like noise to occur while driving as they may have excessive play. To check if a Wheel Bearing is failing is to steer your Car from side to side while driving straight, you could hear excessive noise as chassis weight is rolled onto the defective Wheel Bearing. Worn out front Car Wheel Bearings can cause damage to the Brake Rotors as it is inter connected, resulting in a low brake pedal of your Car. On a rear Wheel Drive vehicle, worn out Wheel Bearings with excessive play may cause the rear Axle Shaft to run off center in the Oil Seal section, causing the Axle Oil Seal to leak.

Failures of Wheel Bearing & Hub Assembly in your Car are common and may be due to bad roads and exposure to harsh weather conditions or could be to low product standards the manufacturers are using to keep cost of vehicles under control. On ABS equipped vehicles, the Wheel Speed Sensor is incorporated into the Wheel Bearing Assembly, so if the bearing has excessive clearance the Sensor will fail resulting in the check engine ABS Light to illuminate in the dash board of your Car. Often when Wheel Bearings are checked with the Car is raised on a hoist, with no load on the wheels to check the problem accurately, it may require a road test with a set of small microphones placed on each Axle Assembly to pinpoint which Wheel Bearing is making the noise. A noisy Car Wheel Bearing has been often mistaken for a transmission problem as the noise can transfer through the Axle, Suspension and vehicle body giving the indication that the noise is originating from another source.

Once a Bearing Seal starts to leak, the damaged seal can allow grease to leak out of the Wheel Bearings, therefore dirt and water can then enter the Bearing cavity.

Although Car Wheel Bearings are designed to last 150,000 miles or more, the constant regular load and driving abilities does take a toll on the Wheel Bearings, the grease and on the seals. If a Wheel Bearing fails prematurely, it is as a result of mis-adjustment, contamination or loss of grease. Wheel Bearings which are not factory sealed do require periodic maintenance and to be cleaned, inspected and greased at about every 30,000 miles or according to the manufacturer’s recommendations.

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