Wheel bearing replacement

Hi –
On BMW x3 does the front wheel bearing have to be replaced with the hub assembly, or is it possible to replace the bearing only?
Thank you

My car has 80000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
The front wheel bearings would need to be replaced with the front hub assembly unless you have the very specialized puller and press tools to remove and install the bearings. It is recommended to replace hub and bearing as an assembly.

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You`ll probably need to use a wrench (and/or a hammer) to remove the end of the hub and any anti-lock brake wheel that may be part of your hub. Then, you may need to use a specialized “puller” tool to remove the central bolt. The bearing assembly should come apart easily.
The average cost for a BMW 328i Wheel Bearing Replacement is between $631 and $766. Labor costs are estimated between $453 and $572 while parts are priced between $177 and $194.
Can You Replace Wheel Bearings Yourself? You can lower your wheel bearing replacement cost by changing them yourself. You should be able to do this in your own garage. However, it will require some specialized tools.
Your wheel bearing may have been damaged slightly in the past and has now worn to the point it is starting to make noise. Your mechanic is correct in that the only repair for the bearing is to replace the hub. It is a sealed unit and cannot be disassembled without destroying it.
We know it`s super frustrating when car parts unexpectedly fail: the short answer is that yes, you need your alignment checked after replacing a wheel hub.
How Long Do Wheel Bearings Last? In theory, wheel bearings can last as long as the vehicle itself. However, depending on road conditions and driving habits, you can expect to replace one wheel bearing for every 150,000 miles of driving.
Unless both bearings on all side of the wheels are overworked, there is no need to replace them all at once. You should only swap out the ones that need it.
A: Eventually, all wheel bearings wear out and will need to be replaced. Assuming normal service under typical driving conditions, the newer, “hub-assembly” style bearings found on most modern vehicles should last around 100,000 miles when maintained properly.
If your wheel bearing fails, it can cause the wheel to stop while you are driving or possibly even to fall off. At the very least, before a wheel falls off, a failed wheel bearing can/will cause significant damage to your vehicle, so it`s very important to keep an eye on these and keep them maintained.
Luckily, bearings aren`t difficult to replace, and most modern vehicles use either bolt-in or pressed-in bearings. With the right tools, you can perform this replacement by yourself: Park your car on a safe, flat surface and secure the wheels you aren`t working on with wheel chocks.
Most serviceable wheel bearings need maintenance every 25,000 to 30,000 miles, or during every brake service. But, the average life of a sealed wheel bearing and hub assembly is about 85,000 to 100,000 miles, without the opportunity for a technician to repack the bearings.
Since wheel bearings are what your tires spin on, they can reduce your acceleration as they fail. Due to poor lubrication or rust, wheel bearings can start to perform worse, and they won`t let your vehicle acceleration freely.
A sure sign that your bearing has failed is vibration. If the raceway surface of the bearing becomes damaged by abrasion, the rolling elements (the balls or rollers) will bounce around on the raceway surface during operation, causing high levels of vibration.
One of the most alarming and noticeable signs of bad wheel bearings are brake issues, which can occur when your wheel bearings are worn down and loose in the housing. You may notice inefficient braking on the road, brake “slips,” or uneven wear on your brake pads.
If Only One Bearing Is Bad, Do I Have To Replace Them Both? No. Your car`s wheel bearings are entirely separate, and a failure in one bearing does not affect the others. You only need to replace the bearing that has failed.
If Only One Bearing Is Bad, Do I Have To Replace Them Both? No. Your car`s wheel bearings are entirely separate, and a failure in one bearing does not affect the others. You only need to replace the bearing that has failed.
the whole assembly must be replaced. It cannot be rebuilt or repaired. Adjustable wheel bearings on older vehicles, on the other hand, can be adjusted, cleaned and repacked with grease, and replaced if the bearings are bad. A leaky grease seal can also be replaced without having to replace the bearings, too.
Luckily, bearings aren`t difficult to replace, and most modern vehicles use either bolt-in or pressed-in bearings. With the right tools, you can perform this replacement by yourself: Park your car on a safe, flat surface and secure the wheels you aren`t working on with wheel chocks.
Luckily, bearings aren`t difficult to replace, and most modern vehicles use either bolt-in or pressed-in bearings. With the right tools, you can perform this replacement by yourself: Park your car on a safe, flat surface and secure the wheels you aren`t working on with wheel chocks.
Responsible for attaching the wheel to the car, a wheel hub assembly is a pre-assembled unit that features precision bearings, seals and sensors.

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the most relevant questions and answers related to your specific issue

I hear an abnormal noise from front driver’s side wheel. It sounds like a wheel bearing but not sure.
ANSWER : A wheel bearing noise can be different between vehicles as some designs may vary a little. The most common is a roaring noise that may change when going around turns. It may be louder going in one direction or the other or just make a loud noise all of the time. The wheel hub presses into the wheel bearing. The hub is where the studs are for the wheel to be bolted onto the steering knuckle and the bearing provides the support for the wheel and weight of the vehicle. Consider hiring an experienced technician like one from YourMechanic who can come out and take a closer look at your wheel bearing noise to offer a more personal diagnosis.

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When replacing a wheel hub on an acura , do I have to replace the wheel bearing to? 1997 Acura RL
ANSWER : Hello – perhaps the question should be "Do I have to replace the wheel hub/bearings if one or more studs are broken off?". And, the answer is "No, simply replaced the broken studs." That is – unless the hub or wheel bearings were damaged by whatever incident broke the studs. If it is necessary to replace the hub, you are better off buying a hub/bearing assembly – even if you have a choice (for most new cars, you don’t). Replacing a bearing within a hub requires heavy duty press tools to press the old bearing out and the new bearing in. you need experience, comfort level and specialized tools for this. I would recommend having a wheel hub/bearing assembly replacement done by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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When the dealer says u need to replace a wheel bearing, do they mean just the bearing or the bearing/hub assembly?
ANSWER : Hi There,
This means generally the wheel bearing/hub assembly which typically comes all pressed together in one assembly. You should not need to replace all four of them unless the others are also making noise or showing signs of wear or failure.

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Can a poorly installed wheel bearing cause extensive damage when driven on?
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It’s highly unlikely that the installation of a wheel bearing causes mechanical damage that the mechanic has listed above. Typically those components (Axle shaft leaking, steering knuckle, lower ball joint, lower control arm, front strut) are not touched during a wheel bearing replacement. However, it is very possible that the diagnosis of damage due to accident is simply wear and tear, which tends to happen on Toyota Prius’ quite often and usually around 50,000 miles.

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Why is my wheel bearing always acting up?
ANSWER : Greetings and thank you for writing in with this question! If the vehicle is lifted or has larger-than-stock tires, this may be the cause of the wheel bearing problem. Non-stock ride height and custom suspension parts cause undue stress on the wheel hubs and bearings. Additional possibilities include water and/or mud intrusion in the hub/bearing assembly. You may address your situation by replacing the front hubs and bearings with aftermarket units. Scheduling an appointment to diagnose the situation and installation is important, as improper installation can cause these failures as well.

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4 wheel high wont work, 2 wheel and 4 wheel low will. 1997 GMC Sierra Electronic shift (of course). Replaced the front axel actuat
ANSWER : You are correct to think that the transfer case itself or the control module for it could be causing this issue. The only other possibility would be a wiring issue directly behind the switch preventing the four wheel drive high setting from working properly. I would enlist in the assistance of a qualified professional to check your four wheel drive circuit with a wiring diagram and digital multimeter to determine if the issue is electrical or mechanical. Once this has been done, the correct repair procedure can be identified.

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