Hydraulic Control Unit, Removing and Installing

Hydraulic control unit, removing and installing

Special tools, testers and auxiliary items required





^ Brake pedal depressor V.A.G 1869/2





^ Sealing plug repair kit, Part no. 1H0 698 311 A





Location:
The hydraulic control unit is installed on left-hand side of engine compartment.

Removing

CAUTION: Brake lines must not be bent.

- Note or request radio code on vehicles with coded radio, if necessary.
- Disconnect battery.





- Release connector from control unit in direction of - arrow - and disconnect.
- Insert brake pedal actuator V.A.G 1869/2 between brake pedal and drivers seat. Depress brake pedal at least 60 mm.

The brake pedal actuator V.A.G 1869/2 must remain in position until all brake lines have been reconnected to the hydraulic unit.

Note: Protect engine compartment against escaping brake fluid.

- Disconnect brake lines from hydraulic unit.





- Loosen securing bolt - 1 - and pull coolant expansion tank out in direction of - arrow -, then swivel tank to one side.
- Tightening torque: 6 Nm





- Seal brake lines and threaded holes with plugs from repair kit Part No.1H0698311 A.

Note: Protect plenum chamber and engine compartment against any escaping brake fluid.

- Unscrew and remove lines - 1 -, - 2 - and - 3 -.

Note: On vehicles from model year 2002 a flexible hose has been installed as part of the brake lines; on vehicles built before model year 2002 the brake lines have to be disconnected at brake booster.





- Disconnect brake lines - 1 - and - 2 - and seal with sealing plugs from repair kit, Part No. 1H0 698 311 A.





- Disconnect connectors -1-.
- Unclip brake lines from bracket - 2 -.





- Release retaining clip from below - 1 - and pull it out in direction of - arrow -.
- Remove hydraulic control unit.

Installing
Pay special attention to the following on installation:

Note:
^ Do not remove sealing plugs from new hydraulic control unit until corresponding brake line is to be installed.
^ If sealing plugs are removed from hydraulic unit sooner, brake fluid may escape and it may no longer be possible to fill and bleed the unit properly.

- Bleed brake system.
- Enter radio code.
- Connect battery.

Tightening torques