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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6.4.7. Removal and installation of the sensor of frequency of rotation on a back axis

Fig. 6.83. ABS system components on a back axis (the forward drive): 1 – back brake support; 2 – a wheel nave with a rotor; 3 – a bolt with a fillet; 4 – brake disk; 5 – wheel bolt; 6 – case of the wheel bearing; 7 – rotation frequency sensor; 8 – a bolt with an internal hexagon; 9 – bolt, 75 N · m



Removal
Weaken wheel bolts.
Lift the car.
Remove a wheel.
Switch off ignition.
Unscrew a bolt with a six-sided head 2

Fig. 6.84. Rotation frequency sensor


Take the sensor of frequency of rotation 1 of a rotary fist (fig. 6.84).
Turn off the Torx 3 screw and take the holder of a cable

Fig. 6.85. Holder of a cable


Unscrew a bolt with a six-sided head of 1 (fig. 6.85).
Unscrew the Torx 2 screw and take the holder of a cable.
Release a rotation frequency sensor wire from holders.

Fig. 6.86. Fastening of an overlay of the bottom


Remove an overlay of the bottom (fig. 6.86).
Take from fastening a seat in a back part of a body
On the Cabrio cars it is in addition necessary to remove a side upholstery.

Fig. 6.87. The holder of a cable I will also corrode rotation frequency sensor wires


Remove the holder of a cable, disconnect the socket of 1 wire of the sensor of frequency of rotation and to squeeze out a nozzle (from the left and right side an arrangement mirror) (fig. 6.87).

Installation
Installation is carried out in the return sequence.
Grease a sealing ring of the sensor of frequency of rotation before installation on perimeter with plastic lubricant.
Lift the car.
Turn off a wheel.
Take the rotation frequency sensor from a rotary fist.
Check a rotor for existence of pollution and damages.


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

6.4.8. Removal and installation of a rotor on a back axis