Master Brake Cylinder

Master Brake Cylinder

Special tools, testers and auxiliary items required

• Brake Charger/Bleeder Unit (VAS 5234)

• Torque Wrench 5-50 Nm (V.A.G 1331)

Removing

- If the vehicle has a coded radio, get the radio code from the customer before beginning.

- Disconnect battery.

- Remove the intake hose, air filter housing (diesel engines and some gasoline engines) and the battery.

On vehicles with a 6-cylinder gasoline engine, battery is in the luggage compartment, accordingly only the air filter housing must be removed.

- Remove the battery carrier.

- Place sufficient lint-free cloths in the area of the engine and transmission.

- Extract as much brake fluid as possible from the brake fluid reservoir with the (VAS 5234).

Vehicles with Manual Transmission

- Disconnect the clutch slave cylinder return hose - B - and secure it out of the way or clamp it off with a commercially available tool such as the Ha 4590 and then remove it.






All Vehicles

- Remove the connector - A - from the brake fluid level warning switch (F34).

- Pull off connector - C - from the brake lamp switch (F).

- Remove the brake fluid reservoir, press the engagement straps toward outside at reservoir and simultaneously pull brake fluid reservoir out of sealing plugs.






- Disconnect the brake lines - 1 - at the brake master cylinder and seal the lines with sealing plugs from repair kit Part No. 1H0 698 311 A.

- Remove the nuts - 2 - from master brake cylinder.

- If present, remove heat shield.

- Carefully take brake master cylinder out of brake booster.

- Remove the brake lamp switch from brake master cylinder.

Installing

- Install in reverse order of removal.

Observe the following points when installing:

- When installing together the brake master cylinder and brake booster, make sure that the push rod is correctly located in the brake master cylinder.

- Bleed the brake system. Refer to => [ Hydraulic System, Bleeding ] Hydraulic System, Bleeding.