Brake System, Bleeding with Brake Filler/Bleeder Unit VAS 5234

Brake System, Bleeding with Brake Filler/Bleeder Unit VAS 5234

Special tools, testers and auxiliary items required

• Brake Filler/Bleeder Unit (VAS 5234)

• or

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


Only use new brake fluid conforming to VW standard (VW 501 14).

• 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).

- Remove rear wheels.

Pre-Bleeding

- Connect (VAS 5234).

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 hydraulic unit must be bled once more via function basic setting using (VAS 5051).

Initiate basic setting (to bleed the 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 (VAS 5234).

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

1 - Left front brake caliper

2 - Right front brake caliper

3 - Left rear brake caliper

4 - Right rear brake caliper

• Use 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 valve open long enough that brake fluid exits without bubbles.

Post-Bleeding

A second technician is required to assist:

- 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 - 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 ABS regulation must be performed!

- Install rear wheels.

Tightening specification for wheel bolts.