Bleeding Brake System with Brake Charger/Bleeder Unit (VAS 5234) or (V.A.G 1869)

Bleeding Brake System with Brake Charger/Bleeder Unit (VAS 5234) or (V.A.G 1869)

Special tools, testers and auxiliary items required

• Brake Charger/Bleeder Unit (VAS 5234)

• or

• Brake Charger/Bleeder Unit (V.A.G 1869)

• Brake Charger/Bleeder Unit Suction Adapter (V.A.G 1869/4)

• Tool Set for Brake Bleeding (VAS 6564)

• On vehicles with EDL, EDL/ASR or EDL/ASR/ESP, the brake system must be pre-bled when a chamber in the brake fluid reservoir is completely empty (for example brake system leaking).

Pre-Bleeding

- Connect (VAS 5234) or (V.A.G 1869).

Bleeding sequence:

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

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

- With bleeder bottle hoses attached, leave 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 => [ Connecting and Selection Functions ] Testing and Inspection.

- Then, brake system must be bled normally.

Bleeding

• Adhere strictly to work sequence when bleeding brake system.

- Connect brake filling and bleeding tool (VAS 5234) or (V.A.G 1869).

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

1- Front left brake caliper

2 - Right front brake caliper

3 - Left rear brake caliper

4 - Right rear brake caliper

• Use suitable bleeder hose. It must seat tightly on bleed screw so that no air can enter brake system.

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

Post-Bleeding

• Perform a post-bleeding when:

• The brake pedal travel is too long, or the so-called soft brake pedal.

A second technician is required during the post-bleeding.

- Depress brake pedal forcefully and hold.

- Open bleeder valve at brake caliper.

- Press brake pedal down onto stop.

- Close bleeder valve with pedal depressed.

- Release brake pedal slowly.

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

Bleeding sequence:

1- Front left 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 ABS regulation must be performed!