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

Brake System Bleeding with 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)

• Brake charger/bleeder unit suction adapter (VAG 1869/4 )

Commercially Available Tool





• On vehicles with Electronic Differential Lock (EDL), EDL/Anti-Slip Regulation (ASR) or EDL/ASR/Electronic Stabilization Program (ESP), the brake system must be pre-bled when a chamber in the brake fluid reservoir is completely empty (e.g. brake system leaking).

Pre-Bleeding

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

Bleeding Sequence

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

2 - Bleed the left rear and right rear brake caliper together simultaneously.

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

Then the hydraulic unit must be bled again with the "Basic setting " function 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 ] Testing and Inspection.

- Then, brake system must be bled normally.

Bleeding

Adhere strictly to work sequence when bleeding brake system.

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

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

1- Left front brake caliper.

2 - Right front brake caliper.

3 - Left rear brake caliper.

4 - Right rear brake caliper.

Use a suitable bleeder hose. It must fit tightly on the bleeder valve so that no air can enter the brake system.

- With the bleeder bottle hose attached, leave the bleeder valve 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 the bleeder valve at the brake caliper.

- Press the brake pedal down until stopped.

- Close the bleeder valve with the pedal pressed.

- Release the brake pedal slowly.

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

Bleeding Sequence

1- Left front brake caliper.

2 - Right front brake caliper.

3 - Left rear brake caliper.

4 - Right rear brake caliper.

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