Brake Master Cylinder: Service and Repair

Master Cylinder

Special tools, testers and auxiliary items required

• Brake charger/bleeder unit (VAS 5234)

• Torque wrench 5 - 50 Nm (VAG 1331)

Removing

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

- Disconnect the battery.

- Remove the battery.

An exception is the V6 Eos; in this case remove the air filter housing.

- Remove the battery casing.

- 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 using the brake charger/bleeder unit (VAS 5234) or extraction device (VAG 1869/4).

With a 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 Hazet 4590 and then remove it.





Continuation for All

- Disconnect connector - A - from the floating warning indicator sensor.

- Disconnect the connector from the brake light switch (only on vehicles from 11.05).

- 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 - from the master cylinder and seal the lines with sealing plugs from repair kit part no. 1H0 698 311 A.

- Remove nuts - 2 - for the master cylinder.

- If present, remove heat shield.

- Carefully remove master cylinder out of brake booster.

Installing

- Installation is performed in the reverse sequence.

Observe the following points when installing:

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

- Bleed the brake system. Refer to => [ Brake System Bleeding General Information ] Brake System Bleeding General Information.