Hydraulic block
Warning: On models with ABS, disconnect the battery before opening the hydraulic system and do not connect the battery until you have bled the system. If this is not done, air can enter the hydraulic pump, from where it will be extremely difficult to remove it, and specialized diagnostic equipment will be required (see paragraph 2).
Note: Audi states that after removal and installation of the units, the operation of the system must be checked using specialized equipment. Taking this into account, it is recommended to entrust the removal and installation of blocks to the specialists of the dealer car service. If you decide to carry out these operations yourself, check the system on diagnostic equipment as soon as possible.
Withdrawal
1. Disconnect the negative cable from the battery.
2. If necessary, loosen the mounting screw and remove the plastic relay cover from the hydraulic regulator block.
3. Release the latch and disconnect the wiring connector from the hydraulic unit.
4. If necessary, unscrew the nut and disconnect the wire "masses" from the regulator.
5. Raise the front of the vehicle and install safety stands. Remove the left front wheel.
6. Attach a piece of hose to the fitting of the left caliper, lowering its other horses into the jar, as written off in paragraph 2. Open the fitting and press the brake pedal to the stop and fix it there with a wooden block, resting it on the seat. When finished removing the liquid, wrap the fitting.
Note: The brake pedal must be kept depressed until the hydraulic pipes are fully connected to the hydraulic block, until the very end of the procedure.
7. Wipe area around tubing connections. Note how the tubes are connected to the unit so that they are properly installed when reassembling. Loosen the connection nuts and carefully remove the tubes. Isolate the pipes from dirt entering the system. Wash off spilled liquid immediately.
8. Loosen the hydraulic unit mounting nuts and remove the assembly from the engine compartment. If necessary, the mounting bracket can be dismantled by unscrewing the mounting bolts. Damaged or worn regulator mounts must be replaced.
Note: When removing and storing, keep the unit upright so that liquid does not spill out and air does not get inside.
Installation
Note: New blocks are delivered to spare parts fully pumped and filled with brake fluid. It is vital to keep the plugs closed until the tubes are connected so that air does not get inside.
9. Place the unit on the bracket and tighten the fastening nuts to the prescribed torque.
10. Remove plugs and reattach hydraulic tubes. Tighten the union nuts to the prescribed torque.
11. Connect the wiring connector to the hydraulic block and, if provided, install the cover.
12. Fill the reserve tank with fresh brake fluid (see Weekly checks) and connect the battery.
13. Remove the brake pedal stop and bleed the entire hydraulic system as described in paragraph 2. Before driving on the road, check the operation of the brakes. Have your dealer check the ABS system as soon as possible.
Bosch ABS 5.0 electronic control unit
Withdrawal
14. Remove the rear seat cushion as described in chapter 11 to gain access to the BEU.
15. Turn away screws of fastening and remove the block.
16. Turn off the ignition, release the latch and disconnect the wiring connector from the block. Remove the block from the car.
Installation
17. Installation - reverse procedure.
Front wheel sensor
Withdrawal
18. Disconnect the wire "masses" from the battery.
19. Apply the handbrake. Put wedges under the rear wheels. Raise the front of the vehicle and install safety stands. Remove the corresponding wheel.
20. Trace the wiring from the sensor, freeing it from all fasteners and remembering the styling. Disconnect the wiring connector.
21. Gently pull the sensor out of the steering knuckle bracket and remove it from the vehicle. After removing the sensor, remove the rubber seal and fixing sleeve from the bracket (pic. 19.21).
Installation
22. Make sure the sensor and its mounting surface in the steering knuckle are clean and apply some fine copper grease.
23. Insert the bushing all the way into the rack, then insert the rubber-sealed sensor. Lay and secure the wiring correctly and push the sensor all the way.
24. Connect the wiring connector.
25. Install the wheel (if filmed) and lower the car. Tighten the wheel bolts to the specified torque as described in chapter 1A or 1B. Connect the battery.
Rear wheel sensor
Withdrawal
26. Disconnect the wire "masses" from the battery.
27. Remove the rear seat cushion as described in chapter 11 and locate the sensor wiring connector. Disconnect the connector and release the wiring from the fasteners.
28. Put wedges under the front wheels, turn on the rear (or "R" in case of automatic transmission) transmission. Raise the rear of the vehicle and install safety stands. Remove the corresponding wheel.
29. Trace the wiring from the sensor to the connector and release the sensor wiring from the common braid. Loosen the fastening bolts and remove the protective cover of the wiring from the rear beam, release the rubber seal in the hole in the body and pull out the wiring so. so that you can remove it along with the sensor.
30. Gently pull the sensor out of the rear beam and remove it from the vehicle. After removing the sensor, remove the sleeve (pic. 19.30, a, b).
Installation
31. Make sure the mating surfaces of the lever and sensor are clean. Lubricate the fixing sleeve and sensor with fine copper grease.
32. Insert the bushing into the rear beam hole, then insert the sensor. Lay the sensor wiring in place and push the sensor all the way in.
33. Track the correct laying of the wiring and secure it with all fasteners. Install the protective cover on the rear beam, tightening the fastening screws securely. Push the wiring through the hole in the body and install the rubber seal.
34. Install the rear wheel, lower the car. Tighten the wheel bolts to the specified torque as described in chapter 1A or 1B.
35. Connect the sensor wiring connector, install the rear seat cushion and connect the battery.
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