Brake fluid should be changed once a year, preferably in the spring.
Care must be taken when handling brake fluid.
Suck the liquid out of the tank with a syringe to a level of about 10 mm.
Note: Do not suck out all the fluid, as this will introduce air into the brake system.
Fill the reservoir with fresh fluid up to the mark "max".
Put a tube on the drain valve of the left rear caliper and place a container half-filled with brake fluid under it.
Open the drain valve and press the brake pedal 10 times to pump out the old fluid. Ensure that the other end of the tube is constantly below the surface of the liquid.
Close the drain valve and add fresh brake fluid to the reservoir.
Similarly, pump out the old brake fluid from the remaining calipers.
Attention: The fluid flowing out of the drain valve must be clean and free of air bubbles.