Brake System, Bleeding With VAS 5234 and VAS 5234/1A

Brake System, Bleeding with VAS 5234 and VAS 5234/1A

Special tools, testers and auxiliary items required

• Brake Charger/Bleeder Unit (VAS 5234)

Procedure

- Connect the (VAS 5234) and adapter (VAS 5234/1A).

- Remove the protective cap from the brake caliper bleeder screw and connect the hose of the bleeder bottle to the bleeder screw.

Bleeding sequence

1 Left front brake caliper
2 Right front brake caliper
3 Left rear brake caliper
4 Right rear brake caliper

- Leave the bleeder screw open, with brake fluid hose connected, until brake fluid flows out clear and free of air bubbles.

- To support the bleeding procedure, press the brake pedal 5 times.

- Tighten bleeder screw to 10 Nm, pull off bleeder hose and place protective cap onto bleeder screw.

- Repeat the bleeding procedure in the specified sequence on the remaining brake calipers.

- Fill the brake fluid reservoir, under consideration of brake pad wear, up to the max marking and screw on the sealing cap.

- Start the engine and test the brake pedal travel and brake pedal pressure.

- If the brake pedal travel is too far, check the brake system for leaks and/or repeat the bleeding procedure.

After bleeding brake system, perform zero adjustment on brake pressure sensor 1 (G201).

vehicle diagnosis, testing and information system (VAS 5051 B) or (VAS 5052) => under Guided Fault Finding

A road test must be performed after bleeding. During this, at least one ABS regulation must be performed at all four wheels!

Brake Fluid, Changing

Refer to => Maintenance Procedures