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
6.2.1. The amplifier of the brake drive of tandem type / the main brake cylinder in cars with the left wheel
6.2.2. Removal and installation of the vacuum pump of brakes
6.2.3. Removal and installation of the sensor of pressure of the amplifier of the brake drive
6.2.4. Electric vacuum pump
6.3. Repair of brakes of forward wheels
6.4. ABS system
6.5. Tables
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment
 




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6.2.1. The amplifier of the brake drive of tandem type / the main brake cylinder in cars with the left wheel

Fig. 6.11. Components of the amplifier of the brake drive of tandem type: 1 – vacuum hose; 2 – a bolt with the cylindrical end, 8 N · m; 3 – a tank for brake fluid with the float-operated indicator; 4 – cover; 5 – sealing stopper; 6 – amplifier of the brake drive; 7 – pedal block; 8 – the giving hose; 9 – forward wall; 10 – screw, 25 N · m; 11 – a nut with a fillet, 50 N · m; 12 – main brake cylinder; 13 – brake pipeline, 15 N · m; 14 – manzhetny consolidation



NOTE
The main brake cylinders – non-demountable, i.e. their repair is not provided
Use only new brake fluid. Observe the instructions given on packing with brake fluid.

Adjustment of a spherical head
Adjust a spherical head:
a – 159 mm ±0,5 mm.

Fig. 6.12. Scheme of adjustment of a spherical head



NOTE
The relative plane 1 is intended for the nominal size (fig. 6.12).

At measurement the spherical head has to be exposed perpendicularly to the plane of the amplifier of the brake drive.
Measure distance without laying until the end of a spherical head.
The moment of an inhaling of a spherical head on the amplifier of the brake drive of 30 N · m.

Removal and installation of the main brake cylinder with the amplifier of the brake drive

Fig. 6.13. Repair kit of caps


Removal of the brake cylinder will require a repair kit of caps of 1H0 698 311 A (fig. 6.13).

Removal
Remove a ware compartment from the driver.

Fig. 6.14. Turning of the switch of stoplights


1 turn the switch of a stoplight on 45 ° to the left and take (fig. 6.14).

Fig. 6.15. Connection of a pedal of a brake and amplifier of the brake drive


Disconnect a brake pedal from the amplifier of the brake drive by means of a stripper (fig. 6.15).
Pump out brake fluid by means of a set of the equipment, the unit for pumping of the brake system or the unit for pumping of the brake system.
Uncover the water taking away box.
Lay enough not leaving fibers of rags in the field of the water taking away box.
Open a tank with brake fluid.

Fig. 6.4. Connection of the device to a tank branch pipe with brake fluid


Pump out brake fluid (fig. 6.4).
Disconnect the socket of the sensor of the float-operated indicator 1.

Fig. 6.16. Socket of the sensor of the float-operated indicator and vacuum highway


Remove the vacuum highway 2 (fig. 6.16).

Fig. 6.17. Fixing bolt of capacity of brake fluid


Unscrew a fixing bolt of 1 capacity of brake fluid (fig. 6.17).

NOTE
Take measures for protection of the water taking away box against the following brake fluid.

Capacity of brake fluid fastens on latches to the lower party on the main brake cylinder.
For removal wring out clamps on capacity down and at the same time take the capacity of brake fluid from a cap.
Remove and put aside a tank for brake fluid.

Fig. 6.18. Pipelines of the brake system


Turn off pipelines of the brake system 1 and 2 and close caps from a remkomplekt of ET. – No. 1H0 698 311 A (fig. 6.18).
Lay enough not leaving fibers of rags to the area of the control unit of a hydraulic system.

Fig. 6.19. Pipelines of the brake system and rubber nozzles


Turn off pipelines of the brake system 1 and 2 and take together with a rubber nozzle (fig. 6.19).

Fig. 6.20. Fastening of the amplifier of the brake drive


Unscrew fixing bolts of the amplifier of the brake drive 1 (Torx T45) (fig. 6.20).
Remove the amplifier of the brake drive with the main brake cylinder.
On the cars having a cross-piece it needs to be removed.

Fig. 6.21. Fastening of the main brake cylinder


Turn off fixing nuts of the main brake cylinder 1 (fig. 6.21).
Carefully remove the main brake cylinder from the amplifier of the brake drive.

Installation
At installation especially it is necessary to observe the following.
Before installation of the amplifier of the brake drive clear the water taking away box of the remained flowed-out brake fluid.
At assembly of the main brake cylinder with the amplifier of the brake drive you watch correctness of landing of a press bar on the main brake cylinder.
Adjust the stoplight switch.
Remove air from the brake system.


6.2. Repair of the brake system

6.2.2. Removal and installation of the vacuum pump of brakes