NOTE: Before you begin, make sure that you have the correct type of brake fluid for your vehicle. The recommended brake fluid for the 2003 BMW 745Li is DOT 4.
1. Open the hood of your BMW.
2. Locate the brake fluid reservoir. It is a plastic container with a black cap that is located on the driver's side of the engine compartment.
3. Remove the cap from the brake fluid reservoir.
4. Slowly add brake fluid to the reservoir until it reaches the "MAX" line.
5. Replace the cap on the brake fluid reservoir.
6. Close the hood of your BMW.