How to Replace the Brake Rotors on a BMW 323I

1. Place the wheel chocks behind the rear wheels and raise the car with the automobile jack. Place a jack stand under the vehicle near the jacking point and raise it up to the frame of the car.
2. Remove the wheel, using the lug wrench to remove the lug nuts. If you car has brake wear sensors, disconnect them from the caliper by unplugging the wire.
3. Remove the brake caliper using a socket and ratchet. The retaining bolts might be hard to break loose. Remove the caliper bracket using the socket and ratchet.
4. Remove the special recessed hex fastener from the shoulder of the rotor using the 6mm hex socket and ratchet. If there is corrosion, spray penetrating oil and let it soak in. Pull the rotor off of the wheel. If it doesn't come off easily, hit it several times with the rubber mallet until it breaks free.
5. Put the new rotor on the wheel. Install the hex fastener using the 6mm hex socket and a ratchet.
6. Put the caliper mounting bracket on the wheel assembly. Tighten the bolts with the socket and ratchet. Place the caliper into the bracket. Tighten the retaining bolts using the socket and ratchet. Reconnect the brake wear indicator if you took one off. Plug it into the caliper.
7. Put the wheel back on the car. Tighten the lug nuts with the lug wrench. Remove the jack stand from under the car. Lower the vehicle back to the ground. Repeat the process on the next wheel.