Attention! When the battery is disconnected and the loop is disconnected, the faults introduced during the operation of the vehicle are erased in the ECU-KSUD.
Do not confuse the brake lines when docking with the hydraulic unit.
The design of the hydraulic unit (GA) and the bracket for its installation are shown in Figure 11.67.
Removal of the GA system «DSC» must be done in the following order. Read the information from the ECU fault memory, if necessary, print out the fault code and repair the faults. Switch off the ignition and remove «–» terminal with AB. Press the brake pedal and block it with an emphasis (pic. 11.3).
By car with engine «M62» remove the instrument panel, on a car with an engine «M54» remove the air filter housing. If necessary, disconnect the heater coolant pump with bracket and secure them to the body with a wire clamp. Disconnect ECU connection loop «ABS/ASC+T» («DSC») to GA and its wire (jumper) «masses» from the car body.
Mark with tags (markers) hydraulic connection points (pic. 11.68) to the GA, so as not to confuse them when setting them up. Disconnect the pipelines from the GA. Close the pipelines and fittings of the block with plugs / caps.
Unlock and disconnect the loop from the pressure sensor (light arrow, fig. 11.69).
Unscrew the fixing bolts and remove the HA. Loosen the bolts (8, see fig. 11.67) and remove bracket (4) mounts with GA.
Installation of GA system «DSC» should be carried out in the reverse order, while it is necessary to tighten the bolt of fastening the GA bracket to the body with a torque of 8.0 N·m (0.8 kgf·m).
Piping locations (see fig. 11.68):
- V-front wheels, from THZ circuit V to HA circuit V (front wheel brake drive circuit);
- H-rear wheels, from TNZ contour H to GA H (the contour of the drive of the brake mechanisms of the rear wheels;
- VR - front left wheel, from the GA VR of the front left wheel to the brake mechanism VR;
- VL - front left wheel, from GA HR to HR wheel brake;
- HL - rear left wheel, from GA HL to wheel brake HL.
Tighten pipe fittings to 14 Nm (1.4 kgf·m). Bolts of fastening of an arm on HA to tighten the moment of 8,0 Nm (0.8 kgf·m).
use the system «DIS-BMW» to check:
- functioning of the hydraulic unit;
- coding, when replacing the computer;
- correction of the steering wheel position sensor;
- at the end of the assembly, when replacing the computer.
Pay special attention to the subsequent bleeding of the brake system and the reliability of connecting the terminals «masses».