Back Wheel Bearing: Everything You Need to Know

Introduction

A back wheel bearing is a critical component of your vehicle's suspension system. It allows the wheel to rotate smoothly and freely, while also supporting the weight of the vehicle and providing stability. Back wheel bearings typically consist of two rows of ball bearings, separated by a spacer. The inner row of bearings fits snugly onto the axle, while the outer row fits into the wheel hub.

Importance of Back Wheel Bearings

Back wheel bearings play a crucial role in ensuring the safety and performance of your vehicle. They:

• Reduce friction: Bearings allow the wheel to rotate smoothly, minimizing friction and heat generation.
• Support the vehicle's weight: Bearings distribute the vehicle's weight evenly across the wheel, preventing excessive wear on the tires and suspension components.
• Provide stability: Bearings help maintain the wheel's alignment and prevent it from wobbling or shaking.
• Extend tire life: Proper bearing function reduces tire wear and extends their lifespan.
• Improve fuel efficiency: Reduced friction from well-maintained bearings improves fuel efficiency.

Signs of a Bad Back Wheel Bearing

Here are some common signs that may indicate a failing back wheel bearing:

• Grinding or growling noise: A loud, grinding or growling noise coming from the rear of the vehicle, especially when driving at high speeds, is often a sign of a bad bearing.
• Vibration: Worn bearings can cause excessive vibration in the steering wheel, seat, or body of the vehicle.
• Loose or wobbly wheel: If the wheel has excessive play or wobble when you try to move it, it may be an indication of a loose or damaged bearing.
• Increased tire wear: Uneven tire wear, particularly on the inner or outer edges, can be caused by a failing bearing.
• Abs light illuminated: In some cases, a faulty wheel bearing can trigger the ABS (anti-lock braking system) warning light on your dashboard.

Causes of Back Wheel Bearing Failure

The most common causes of back wheel bearing failure include:

• Improper installation: Incorrectly installed bearings or improper tightening can lead to premature failure.
• Excessive weight: Overloading the vehicle or carrying heavy loads can put excessive strain on the bearings.
• Harsh driving conditions: Extreme driving conditions, such as potholes, rough roads, or water crossings, can wear out bearings prematurely.
• Water damage: Water or moisture intrusion can cause the bearings to rust and fail.
• Lack of lubrication: Insufficient lubrication or improper lubrication can lead to increased friction and bearing failure.

Diagnose a Bad Back Wheel Bearing

To diagnose a bad back wheel bearing, you can:

• Listen for noises: Drive the vehicle at different speeds and listen for any grinding or growling noises coming from the rear wheels.
• Check for vibration: Drive at highway speeds and feel for any excessive vibrations in the steering wheel, seat, or body of the vehicle.
• Inspect the wheel: Inspect the wheels for any signs of play or wobbling. Grab the wheel at the 3 and 9 o'clock positions and try to jiggle it. Excessive movement may indicate a loose or damaged bearing.
• Raise the vehicle: Jack up the vehicle and spin the wheels by hand. Listen for any grinding or rumbling noises.

Back Wheel Bearing Replacement

Replacing a back wheel bearing requires specialized tools and knowledge. It is recommended that you have the work done by a qualified mechanic. The cost of replacing a back wheel bearing can vary depending on the make and model of your vehicle, the cost of parts, and the labor charges. However, the average cost of replacing a back wheel bearing is around $400 to $600 per wheel.

Steps Involved in Back Wheel Bearing Replacement:

1. Remove the wheel and tire.
2. Remove the brake caliper and rotor.
3. Remove the hub assembly.
4. Press out the old bearing.
5. Press in the new bearing.
6. Reassemble the hub assembly, brake caliper, and rotor.
7. Tighten the wheel lug nuts.

Preventive Maintenance for Back Wheel Bearings

To extend the life of your back wheel bearings, it is important to:

• Avoid overloading the vehicle.
• Drive carefully on rough roads.
• Inspect the bearings regularly for any signs of wear or damage.
• Lubricate the bearings according to the manufacturer's recommendations.

How to Lubricate Back Wheel Bearings

Lubricating back wheel bearings is essential for their proper functioning and longevity. Here is how to lubricate them:

1. Remove the wheel and tire.
2. Remove the brake caliper and rotor.
3. Apply a high-quality bearing grease to the inner and outer races of the bearing.
4. Reassemble the brake caliper, rotor, and wheel.

Benefits of Regular Maintenance

Regular maintenance of your back wheel bearings can provide several benefits, including:

• Extended bearing life: Proper lubrication and maintenance can significantly extend the life of your bearings, saving you money on costly repairs.
• Reduced noise and vibration: Well-maintained bearings operate smoothly and quietly, reducing noise and vibration in the vehicle.
• Improved fuel efficiency: Reduced friction from properly lubricated bearings can improve fuel efficiency.
• Increased safety: Proper bearing function ensures stability and prevents wheel wobbles, enhancing overall vehicle safety.

Comparison of Back Wheel Bearing Types

There are two main types of back wheel bearings:

Tips and Tricks for Back Wheel Bearing Maintenance

Here are some tips and tricks to help you maintain your back wheel bearings:

• Use high-quality bearing grease: Choose a grease specifically formulated for automotive wheel bearings.
• Apply grease liberally: Do not be afraid to apply grease generously to the bearings.
• Regularly inspect the bearings: Check the bearings for any signs of wear or damage on a regular basis.
• Avoid overtightening the wheel lug nuts: Overtightening can damage the bearings and reduce their lifespan.

FAQs about Back Wheel Bearings

1. How often should I replace my back wheel bearings?
The lifespan of back wheel bearings varies depending on factors such as driving conditions and vehicle usage. However, most experts recommend replacing them every 50,000 to 100,000 miles.

2. Can I drive with a bad back wheel bearing?
Driving with a bad back wheel bearing is not recommended. A failing bearing can lead to severe damage to the wheel, hub, and other suspension components.

3. What is the best way to diagnose a bad back wheel bearing?
The most common way to diagnose a bad back wheel bearing is to listen for grinding or growling noises coming from the rear wheels, especially when driving at high speeds.

4. Can I replace back wheel bearings on my own?
Replacing back wheel bearings requires specialized tools and knowledge. It is recommended that you have the work done by a qualified mechanic.

5. How can I prevent back wheel bearing failure?
Regularly inspect the bearings for any signs of wear or damage, avoid overloading the vehicle, and drive carefully on rough roads.

6. What are the symptoms of a bad back wheel bearing?
- Grinding or growling noise coming from the rear wheels
- Vibration in the steering wheel, seat, or body of the vehicle
- Loose or wobbly wheel
- Uneven tire wear

Call to Action

If you are experiencing any of the signs of a bad back wheel bearing, do not ignore them. Replacing a worn-out bearing is essential for the safety and performance of your vehicle. Schedule an appointment with a qualified mechanic for a thorough inspection and repair as soon as possible.