Attention! Release the pressure in the hydraulic accumulator of the brake system. To do this, turn off the ignition and press the brake pedal all the way (about 20 times) until it becomes "hard".
2. Place a rag near the base of the hydraulic unit accumulator to collect any spilled brake fluid.
3. Unscrew the battery using a hexagonal socket wrench and remove the battery (the O-ring marked with an arrow is the one that needs to be replaced).
4. Install a new O-ring seal and install and secure the battery.
5. Connect the battery and turn on the ignition. The hydraulic unit pump should start working and turn off within 60 seconds, otherwise it is necessary to look for a fault in the hydraulic unit accumulator.
6. Remove air from the brake system.