If it's like most BMW brake rotors you don't remove the center nut to remove the rotor. You should see a slotted screw in the rotor a couple of inches out from the center. Remove it and the rotor comes off. Might have to tap rotor with a rubber mallet but it should come right off.
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The front wheel bearing for your Impala is an integrated wheel hub/bearing/ABS. The whole thing gets replaced. It should look like the one off my Bonneville; Bearing.
Remove wheel/tire. Remove brakes. Remove rotor. Remove axle nut. Press-out axle shaft*. Unplug ABS connector. Remove 3 bearing bolts. *To press out axle, you may need a special tool from an auto parts store. Don't forget to put the heat sheild back on during reassembly, and the axle nut need to be very tight.
IF IT IS DISK BRAKES, NOT HARD! JACK IT UP. REMOVE TIRE. ON BACK OF DISK BRAKE HOUSING IS TWO BOLTS. REMOVE THOSE, AND REMOVE DISK BRAKE SYSTEM FROM HUB. TAKE DUST CAP OFF HUB. REMOVE LARGE NUT. MAY NEED TO REMOVE COTTER KEY FIRST, THEN NUT COVER. FRONT BEARING, AND WASHER WILL COME OUT WHEN YOU WIGGLE DRUM. TAKE DRUM OFF, AND TURN OVER. REMOVE SEAL, AND REAR BEARING. YOU'LL HAVE TO GET A NEW SEAL FOR THAT PART. GREASE NEW BEARINGS, AND REPLACE THEM! THE NEW SEAL CAN BE TAPPED IN WITH A RUBBER HAMMER, OR HAMMER TILL IT IS LEVEL WITH THE RING IT GOES INTO! THEN PUT HUB BACK ON SPINDLE, AND REVERSE DIRECTIONS TILL IT IS COMPLETE!
No, there are no special tools required beyond everyday hand tools.
Raise the vehicle.
Remove the rear wheel and tire assembly from the vehicle If the vehicle is equipped with rear drum brakes, remove any retainer clips from the wheel mounting studs, then pull the brake drum off the hub and bearing.
If the vehicle is equipped with rear disc brakes perform the following:
Remove the two guide pin bolts securing the front disc brake caliper to the steering knuckle.
Remove the disc brake caliper from the knuckle and brake rotor.
Hang the caliper out of the way using a wire hanger or cord. Do not support the caliper by letting it hang by the hydraulic hose.
Remove any retainer clips from the wheel mounting studs, then pull the brake rotor off the hub and bearing.
Remove the dust cap from the hub and bearing assembly
Remove the retaining nut, then the hub and bearing from the knuckle's spindle
Replacing the front wheel bearing/hubs can be a big job for the inexperianced. Briefly...
Remove brake caliper assembly, do not remove brake line.
Remove caliper bracket.
Remove brake rotor.
Unplug ABS sensor.
Remove the large axle nut.
Press axle out of bearing (may need special tool)
Remove the 3 bearing bolts and remove bearing.
If you are asking how to do this ... I first need to say this is not a job for the untrained. You will have to have special tools and skills to efffect this repair.
If you do have the specifications (get from the public library) and the special tools (at a minimum - torque wrench, pliers, screw driver, hammer, floor jack, jack stands), and the right parts, you still need to get the special grease (and be ready to pack the bearings) before you even jack the truck up.
If done incorrectly, the consequences are pretty grim, ranging from a wheel lock up to loss of a wheel and colateral damage. Don't enter into this project lightly.
the front wheel bearings on your car are not sold except as a front wheel hub assembly with the bearing pre-installed, they run about $100.00 each, to replace them requires no special tools, all u do is remove the wheel, the brake caliper and the brake rotor and the hub nut, then the hub just slides off, u will most likely need a very large socket for the hub retaining nut.
the center cap is your hub. It can be removed by a special tool (don't know tool number) but its a hub removal tool. Or you can use a brass punch and 5lb sledge and knock it loose that way. Another suggesion is to by a pully