Hydraulic System, Bleeding With Brake Charger/Bleeding Unit

Special tools and workshop equipment required

The brake system is divided diagonally.

The bleeding of the hydraulic system using the Brake Charger/Bleeder Unit: VAS5234 is described.
An initial pressure of 2 bar (29 psi) is required to bleed the ABS Hydraulic Unit -N55-.

Procedure

Fig 1: Brake Fluid Reservoir

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-- Fill the brake fluid reservoir with brake fluid up to the "max" mark (example photo).

-- Connect the : VAS5234 with : VAS5234/1A (example photo).

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-- Set the correct pressure on the Brake Charger/Bleeder Unit. Refer to the operating instructions from the : VAS5234 .

TIP:

For certain tire combinations the removal of the wheels is required.

-- Remove the protective cap from the bleed screw on the brake caliper.

Use a suitable bleeder hose. It must be seated tightly on the bleed screw so that no air can enter the brake system.
Follow the operating instructions for the : VAS5234 .

-- Connect the hose -1- on the container.

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Bleeding Sequence

1 - Left Front Brake Caliper

2 - Right Front Brake Caliper

3 - Left Rear Brake Caliper

4 - Right Rear Brake Caliper

Bleed the brake caliper at each bleed screw. If the brake caliper has two bleed screws, bleed the outer screw first.

-- With the bleeder bottle hose attached, leave the brake caliper bleeder valve open long enough so that the brake fluid flows out free of bubbles.

-- Tighten the bleed screw, remove the bleeder hose and place the protective cap on the bleed screw.

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

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

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

-- Fill the brake fluid reservoir with brake fluid up to the "max" mark (example photo).

Fig 2: Brake Fluid Reservoir

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-- Screw down the reservoir.

A road test must be performed after bleeding. During this, at least one ABS control must be performed!

Changing the Brake Fluid

CAUTION:

Faulty brakes increase the risk of an accident.

- Make sure the brakes are working correctly before driving the vehicle for the first time.

Tightening Specifications