Bleeding with Brake Charger/Bleeder Unit VAS 5234 or VAG 1869

Bleeding with Brake Charger/Bleeder Unit VAS 5234 or VAG 1869

Description covers bleeding of the brake system using the brake charger/bleeder unit (VAS 5234) or (VAG 1869).

Special tools, testers and auxiliary items required

• Brake charger/bleeder unit (VAS 5234) or

• Brake charger/bleeder unit (VAG 1869)

• Suction adapters (VAG 1869/4)

• If one chamber of the brake fluid reservoir has run completely empty (e.g. leak in the brake system), the brake system must be pre-bled first.

Pre-bleeding

• There are two bleeder valves installed on Brembo brake calipers Always bleed at both bleeder valves.

• Bleed at outer bleeder valve first.

- Connect the brake charger/bleeding unit (VAS 5234) or (VAG 1869).

Bleeding sequence:

1 - Bleed the left and right front brake calipers together simultaneously.

2 - Bleed left and right rear brake calipers together simultaneously.

- With the bleeder bottle hoses attached, leave bleeder valves open long enough that brake fluid exits without bubbles.

Then the hydraulic unit must be bled once more via function " Basic Setting" using the (VAS 5051).

Initiate basic setting (to bleed brake system):

(VAS 5051), connecting and selecting functions. Refer to --> [ VAS 5051, Connecting and Selecting Functions ] Scan Tool Testing and Procedures.

- Then, the brake system must be bled normally

After bleeding the brake system, basic setting for brake pressure sensor 1 (G201) must be performed.

Bleeding

Adhere strictly to work sequence when bleeding the brake system.

• There are two bleeder valves installed on Brembo brake calipers Always bleed at both bleeder valves.

• Bleed at outer bleeder valve first.

- Connect the brake charger/bleeding unit (VAS 5234) or (VAG 1869).

- Open bleeder valves in the prescribed sequence and bleed the brake calipers.

1 - Right rear brake caliper

2 - Left rear brake caliper

3 - Right front brake caliper

4- Left front brake caliper

Use a suitable bleeder hose. It must fit tightly on bleeder valve so that no air gets into brake system.

- With bleeder bottle hose attached, leave bleeder valves open long enough that brake fluid exits without bubbles.

Post-bleeding

A second mechanic is required to assist:

- Press the brake pedal forcefully and hold.

- Open bleeder valve at the brake caliper.

- Press brake pedal down to the floor.

- Close bleeder valve with pedal pressed.

- Release brake pedal slowly.

This bleeding procedure must be performed 5 times per brake caliper.

Bleeding sequence:

1 - Right rear brake caliper

2 - Left rear brake caliper

3 - Right front brake caliper

4- Left front brake caliper

A road test must be performed after bleeding. During this, at least one Anti-lock Brake System (ABS) regulation must be performed!