Sequence of works
1. Raise the vehicle so that both rear wheels are off the ground. Secure the vehicle.
2. Loosen one wheel bolt on each rear wheel (if the wheels are alloy, remove them completely).
Fig. 8.23. This is how you can access the brake mechanism setting gear with the wheel (1) installed on the vehicle. Remove the wheel bolt. The arrow shows the direction of vehicle travel
3. Turn the wheel so that the hole from the removed mounting bolt is positioned at an angle of 45° to the horizontal axis of the wheel upwards, towards the rear of the car (fig. 8.23.) Now, using a screwdriver (4-5 mm wide), you can access the installation gear.
Fig. 8.24. Insert a screwdriver into the hole of the wheel bolt and turn the adjusting gear until the brake disc is locked. Then turn the gear in the opposite direction until the brake disc moves freely
Original can be found on the website (mercedesman.ru)
4. Release the parking brake and turn the adjusting gear with a screwdriver until the rear wheel stops turning. Then turn the adjusting gear back 5-6 teeth (Fig. 8.24). To turn it back on the left side of the car, turn it from top to bottom, and on the right side, turn it from bottom to top.
5. Press the parking brake pedal several times and note the length of the stroke.
6. Check the rear wheel locking and repeat the adjustment if necessary.