Hydraulic block
1. Removal and installation of the hydraulic block in a garage is not possible, since this requires special diagnostic equipment, and BMW equipment is required to bleed the system. In this regard, we recommend that you transfer this work to a specialized service station.
Battery (models with ASC+T system)
2. For the reasons indicated in paragraph 1 of this paragraph, we recommend that you entrust this work to the specialists of the service station.
Electronic control unit (BEU)
3. To remove this block, you must first remove the hydraulic block, since the ECU is fixed on the wall of the hydraulic block. In this regard, we recommend that you entrust this work to the specialists of the service station.
Front wheel sensors
Withdrawal
4. Chock the rear wheels and apply the parking brake. Raise the front of the car and place it on stands (cm."Lifting and placing the car on supports"). Remove the corresponding front wheel. Locate the sensor wiring connector (the connector is located in a plastic protective casing). Remove the cover, remove the connector, and disconnect it (pic. 20.4).
5. Turn out a bolt of fastening of the gauge to a rotary fist and remove the gauge together with electroconducting from the car (pic. 20.5). Note. On some models, the left and right wheel sensors are marked L and R respectively. In addition, the right sensor has two green marks between the sensor and the gasket.
Installation
6. Before installation, apply a little universal grease to the sensor (BMW recommends Staborax NBU 12/k).
7. Be convinced that interfaced surfaces of a rotary fist and the gauge are cleared, then establish the gauge. Make sure the sensor is installed on the correct side of the vehicle (where necessary, see point 5). Screw in the fastening bolt and tighten it to the required torque.
8. Verify that the sensor wiring is properly routed and secured. Connect the wiring connector. Insert the connector into the casing and secure the cover.
9. Install the wheel, lower the vehicle to the ground and tighten the wheel bolts to the correct torque.
Rear wheel sensors
Withdrawal
10. Chock the front wheels. Raise the rear of the car and place it on stands (cm. "Lifting and placing the car on supports"). Remove the corresponding rear wheel.
11. Remove the sensor (see p.p. 4 and 5).
Installation
12. Install the sensor as described in p.p. 6-9.
Front wheel sensor rotors
13. The rotors are fixed on the back side of the hubs. Inspect the rotors for damage or chipped teeth. If the rotor needs to be replaced, disassemble the hub assembly and replace the bearings (see chapter 10).
Rear wheel sensor rotors
14. Rotors are fixed on external hinges of equal angular speeds. Inspect the rotors for damage or chipped teeth. If rotor replacement is necessary, replace drive shaft assembly (see chapter 8).