Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
2. Engine
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
6.1. Preliminary checks
6.2. Repair of the brake system
6.3. Repair of brakes of forward wheels
6.4. ABS system
6.4.1. Instructions on carrying out repair work with anti-blocking system
6.4.2. Anti-blocking system (ABS) Bosch 5.7
6.4.3. Removal and installation of the hydraulic control unit
6.4.4. Replacement of the ABS control unit
6.4.5. Removal and installation of the hydraulic block
6.4.6. Removal and installation of components of the ABS system on a forward axis
6.4.7. Removal and installation of the sensor of frequency of rotation on a back axis
6.4.8. Removal and installation of a rotor on a back axis
6.4.9. Removal and installation of a rotor on a back axis
6.4.10. Removal and installation of the switch of stoplights
6.4.11. Removal and installation of the sensor of cross accelerations and the sensor of rotation around a vertical axis
6.4.12. Removal and installation of the sensor of pressure in the brake system
6.5. Tables
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment
 




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6.4.5. Removal and installation of the hydraulic block

Fig. 6.76. Extraction of the control unit


Turn off bolts 1 and remove the control unit 2 without distortion from the hydraulic unit (fig. 6.76)

Fig. 6.77. Cleaning of the condensing surface


Clean the condensing surface 2, use for this purpose a plastic scraper 1. Check valves 3 regarding damages (fig. 6.77).

ATTENTION
The condensing surface of the hydraulic unit has to be pure and equal.
If the condensing surface or petals of contacts are damaged, then the hydraulic unit is subject to replacement.
Consolidation of the control unit is not replaced.
It is not allowed to take or lift consolidation of the control unit.

NOTE
Do not use aggressive cleaners (use the applied cleaner).

Check the condensing surface for existence of damages (visual control).

Assembly

Fig. 6.78. Installation of the control unit


Carefully pull the control unit of 1 coils via valves of the hydraulic unit 2 (fig. 6.78) down. You watch that valves were not warped.

ATTENTION
Penetration of moisture and particles of dirt in the control unit is not allowed.
The purge of the control unit or hydraulic unit of compressed air is not allowed.
Severe concussion (for example, falling, blow) can cause breakage of the control unit. After that use the control unit it is impossible.

The edge of the case of the control unit has to slide over a ledge in the hydraulic unit.

NOTE
Use new bolts.
To provide tightness of elastic consolidations, it is allowed to install the new control unit on the old hydraulic block no more than two times.
The control unit which was already used repeatedly cannot be installed.

Having pressed the control unit, get it on the hydraulic unit and evenly twist new bolts 1 and 2 (not to tighten) to a uniform prileganiye of the control unit to the hydraulic (N55) ABS block (fig. 6.76).
Twist bolts with 1 on 6 to a prileganiye, but not to tighten.
1–6 tighten bolts in the sequence presented in the drawing.
Inhaling moment: 2,9 N · m.
After twisting check prilegany heads at all bolts.
Install the block.


6.4.4. Replacement of the ABS control unit

6.4.6. Removal and installation of components of the ABS system on a forward axis