Here's a breakdown of the process, assuming sealed bearing units:
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Use jack stands to safely support the vehicle. Wear safety glasses.
* Gather Tools: You'll need: jack and jack stands, wheel wrench, socket wrench set (metric), hammer, large flathead screwdriver (possibly), penetrating oil (like PB Blaster), a new wheel bearing, possibly a press (or a strong vise and sockets of appropriate sizes for pushing out the old bearing), and potentially a hub nut socket if your hub nut is large enough. A hub puller is helpful but not strictly necessary.
* Consult a Repair Manual: A repair manual specific to your 1999 Mitsubishi Mirage is highly recommended. It will provide detailed diagrams and torque specifications.
2. Removing the Wheel:
* Loosen the lug nuts before jacking up the car.
* Jack up the car and securely place it on jack stands.
* Remove the lug nuts and the wheel.
3. Removing the Brake Caliper and Rotor:
* Caliper: Usually, you can just compress the caliper piston with a C-clamp or specialized tool and then hang it out of the way using some wire or a bungee cord. *Be careful not to damage the brake lines.* Some calipers may need to be removed and bolted up out of the way.
* Rotor: Remove the rotor – it might just slide off or require some gentle persuasion with a hammer and a large flathead screwdriver (between the rotor and the hub). *Be careful not to damage the rotor surface*.
4. Removing the Hub Nut:
* Locate the hub nut (often large and very tight). Apply penetrating oil and allow it to soak. Use the correct socket and a breaker bar if needed. It can be very tough, so be prepared.
5. Removing the Hub Assembly (Where a Puller Might Be Helpful):
* Without a Puller: Sometimes, the hub assembly can be removed by firmly tapping the back of the hub (facing the wheel) with a hammer. Work your way around the hub, using firm but controlled blows. Be extremely cautious not to damage the hub or spindle.
* With a Puller: A hub puller threads onto the studs and pulls the hub assembly straight off. This is much safer and less damaging to the hub and knuckle.
6. Replacing the Wheel Bearing:
* Pressing Out the Old Bearing: This almost always requires a press. Attempting to punch it out can damage the hub. The old bearing may be pressed out from the outside or inside, depending on the hub design. A socket of appropriate size may work in a vise.
* Pressing In the New Bearing: Once the old bearing is out, carefully press in the new bearing using a press. Ensure it is seated fully and evenly. *Do not hammer the new bearing in.*
7. Reassembly:
* Reverse the steps above, paying attention to torque specifications (from your repair manual) for the hub nut and other fasteners.
* Inspect all parts. Ensure the rotor is correctly mounted. Bleed the brakes if necessary (if you had to unbolt the caliper).
* After reassembly, test drive the vehicle and check for unusual noises or vibrations.
Important Notes:
* Sealed Units: If the bearing is a sealed unit, the entire hub assembly is often replaced.
* Torque Specifications: Incorrect torque can damage components. Use a torque wrench and consult your repair manual.
* Press: If you lack a press and are unsure about using a vise and sockets, it's best to take the hub to a mechanic. Improper removal and installation can cause serious damage.
This is a general process. Specific steps may vary depending on your vehicle's exact model. Always refer to a repair manual for your specific 1999 Mitsubishi Mirage before attempting this repair. If you're not comfortable with this level of auto repair, take it to a qualified mechanic.
