Brake System - ABS: Component Locations Audi A6 C5 facelift

Special tools and equipment

1. VAG 1331 Torque wrench
2. VAG 1410 Torque wrench
3. VAG 1869/2 Brake pedal depressor
4. VAG 1551 Scan Tool (ST)

Scheme 435

Sealing plugs, repair kit Part No. 1H0 698 311A

Installation location

The hydraulic control unit is installed on the left side of the engine compartment.

Scheme 436

Plug repair set, Part no. 1H0 698 311A

Brake pedal depressor; e.g. from V.A.G 1813

Installation location

The hydraulic control unit is installed on left side of engine compartment.

Scheme 437

1. 80-200 pry lever

Scheme 438

Scheme 439

1. Lift rear seat bench out of locking mechanism.
2. Disconnect ABS wheel speed sensor harness connector and push out grommet (arrow).
3. Raise vehicle.
4. Disconnect ABS wheel speed sensor wiring from retainers (arrows).
5. Remove retainer for ABS wheel speed sensor.
6. Pry ABS wheel speed sensor from wheel bearing/hub unit using 80-200 pry lever.

Scheme 440

Scheme 441

1. Before inserting ABS wheel speed sensor, lubricate circumference of seal with brake cylinder paste.
2. Insert ABS wheel speed sensor -1- until stop. (Scheme 442)
3. Locating tab -A- faces front on left and rear on right.
4. Push ABS wheel speed sensor into wheel bearing housing by hand.
5. Insert retainer for ABS wheel speed sensor.

Note. When routing the ABS wheel speed sensor wiring note the following

Scheme 442

Scheme 443

1. Route ABS wheel speed sensor wiring -1- next to brake line -2- on both sides as shown.
2. On the left side, maintain a clearance of about 2 cm between the heat shield on the exhaust system and ABS wheel speed sensor wiring.
3. On right-hand side, ABS wheel speed sensor wire -1- must be routed between fuel lines -2-.

1. 80-200 pry lever

Scheme 444

1. Raise vehicle.
2. Pry ABS wheel speed sensor from wheel bearing/hub unit using 80-200 pry lever.
3. Inspect ABS wheel speed sensor rotor for dirt and damage through mounting hole of wheel speed sensor. If ABS wheel speed sensor rotor is damaged or dirty, replace rotor together with wheel bearing/hub unit together.
4. Install ABS wheel speed sensor.

Note installation position. See INSTALLING .

1. 80-200 pry lever

Scheme 445

Scheme 446

1. Remove wheel bolts.
2. Raise vehicle.
3. Remove wheel.
4. Remove bolts -A- and use wire to support brake caliper housing to body. (Scheme 446)
5. Remove retainer for ABS wheel speed sensor.
6. Pry ABS wheel speed sensor from wheel bearing/hub unit using 80-200 pry lever.
7. Remove socket-head bolts from wheel bearing/hub unit and remove wheel bearing/hub unit with backing plate.