How to Change the Brake Fluid in a BMW Z4

1. Loosen the lug nuts for the wheels. Lift the car with the floor jack and lower it securely onto jack stands. Remove the wheels and set them aside.
2. Open the hood and remove the lid to the brake fluid reservoir. Use the syringe or similar tool to remove the brake fluid from the reservoir and transfer it to a waste container. Fill the reservoir with fresh brake fluid, filling it past the full mark.
3. Locate the bleeder valve on the right rear caliper, located on the upper, outside of the caliper. Remove the rubber cap so that you can access the nut that loosens the valve. Attach the tube for the bleeder kit to the bleed valve on one end and into a clear plastic container with a small amount of brake fluid in it. Loosen the bleeder valve a quarter-turn with a line wrench.
4. Depress the brake pedal from behind the wheel until you see that the new brake fluid coming out of the caliper and into the container. This may take 15 pumps or more. Check the fluid that is coming out of the caliper periodically and ensure that the brake fluid reservoir is still topped up so that air does not enter the brake system.
5. Tighten the bleeder valve, remove the tube and then reinstall the rubber cap on the bleeder valve. Repeat this process for the left rear wheel, the right front wheel and then the left front wheel until all four corners of the car have been bled. Make sure the reservoir stays full of brake fluid during the procedure so that no air is allowed to enter the brake system. Replace the cap for the brake fluid reservoir.
6. Reinstall the wheels. Lower the car off of the jack stands and tighten the lug nuts for the wheels in a criss-cross pattern.