However, if you're determined to do it yourself, here's a general outline. Remember, this is a *general guide* and specific steps might vary slightly depending on your Trailblazer's trim level and any modifications. Always consult a repair manual specific to your year and model for detailed instructions and torque specifications. A factory service manual (FSM) is highly recommended.
Tools You'll Likely Need:
* Jack and jack stands: Crucial for safety. Never work under a vehicle supported only by a jack.
* Wheel chocks: To prevent the vehicle from rolling.
* Lug wrench: To remove the wheel.
* Socket set and wrenches: Various sizes will be needed.
* Impact wrench (highly recommended): Makes removing the axle nut much easier.
* Ball joint separator: To separate the ball joint from the control arm.
* Tie rod end separator: To separate the tie rod from the steering knuckle.
* Brake caliper compression tool: To compress the brake caliper piston.
* Wheel bearing press or a suitable alternative: Essential for pressing the old bearing out and the new one in. Improvising this can be tricky and risky.
* Penetrating oil: To loosen rusted bolts and parts.
* Torque wrench: Absolutely essential to tighten bolts to the correct specification.
* New wheel bearing and seal: Get the correct part number for your specific vehicle.
* Grease: Pack the new bearing with appropriate grease.
* Safety glasses and gloves: Protect yourself from injury.
General Steps (Highly Simplified):
1. Safety First: Secure the vehicle with jack stands, chock the wheels, and engage the parking brake.
2. Remove the Wheel: Remove the lug nuts and take off the wheel.
3. Remove the Brake Caliper: Remove the caliper bolts and carefully hang the caliper out of the way using a wire or bungee cord. Compress the brake piston using the compression tool.
4. Disconnect the Ball Joint and Tie Rod: This usually requires separating the ball joint from the control arm and the tie rod from the steering knuckle using the appropriate separators. This is often the most challenging part.
5. Remove the Axle Nut: Use the impact wrench (highly recommended) to remove the axle nut. This nut is often very tight.
6. Remove the Hub and Bearing Assembly: Once the axle nut is off, the hub and bearing assembly should come off. You may need to tap it gently with a hammer.
7. Press Out the Old Bearing: This requires a wheel bearing press. Attempting this without the correct tool can damage the hub.
8. Press In the New Bearing: Use the press to install the new bearing.
9. Install the New Seal: Install the new seal if needed.
10. Reassemble Everything: Reinstall the hub and bearing assembly, axle nut, tie rod, ball joint, brake caliper, and wheel. Tighten everything to the correct torque specifications found in your repair manual.
11. Lower the Vehicle: Carefully lower the vehicle.
12. Torque Lug Nuts: Torque the lug nuts to the manufacturer's specifications.
13. Test Drive: Take a short test drive to check for any vibrations or noises.
Important Considerations:
* ABS Sensor: The ABS sensor may be attached to the hub assembly. Be careful not to damage it during removal and reinstallation.
* Torque Specifications: Incorrect torque values can lead to premature failure or damage. Use a torque wrench and refer to your repair manual.
* Preload: The new bearing will need to have the correct preload. This is critical for proper function and requires a good understanding of wheel bearing installation.
This is a very basic overview. Again, this is not a DIY project for beginners. Incorrectly installing wheel bearings can lead to serious consequences, including loss of control of the vehicle. If you are unsure about any part of this process, please consult a professional mechanic. A faulty repair could be far more expensive than paying a mechanic to do it correctly the first time.
