Brake fluid, changing

Special tools, testers and auxiliary items required

Fig 1: Brake Filler And Bleeder Unit VAS 5234

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Fig 2: Brake Filler And Bleeder Unit V.A.G 1869

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Fig 3: Brake Pedal Depressor V.A.G 1869/2

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Use only new brake fluid with replacement part number B 000 700 A (corresponds to US standard FMVSS 116 DOT 4)

WARNING:

Brake fluid must never come into contact with fluids containing mineral oils (oil, gas, cleaning solutions). Oils containing minerals damage seals and sleeves on brake systems.
Brake fluid is poisonous. Due to its caustic nature, it must also never be brought into contact with paint.
Brake fluid is hygroscopic, which means that it absorbs moisture from the air. Always store brake fluid in air-tight containers.
Wash off brake fluid spillage using plenty of water.

Perform the following work sequence:

Fig 4: Identifying Brake Fluid Reservoir Cap

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Follow user manual for Brake filling and bleeding tool VAS 5234 or Brake filling and bleeding tool V.A.G 1869/ !

Fig 5: Extracting Brake Fluid From Reservoir

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With filter inserted, extract as much brake fluid as possible using the suction hose from Brake filler and bleeder unit VAS 5234 - 1 - or Brake filler and bleeder unit V.A.G 1869/ or with a suction bottle.

NOTE:

After extracting, observe that no further brake fluid runs into the reservoir (the brake fluid level in the reservoir must align with the lower edge of the strainer).

WARNING: Do not reuse, (used) extracted brake fluid.

Install and extend Brake pedal depressor V.A.G 1869/2 between driver seat and brake pedal.

Fig 6: Identifying Adapter & Brake Fluid Reservoir

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NOTE:

If adapter - 1 - can not be used because of space limitations, use Adapter VAS 5234/1 or Adapter V.A.G 1869/1 A.

Connect the filling hose from Brake filler and bleeder unit VAS 5234 or from Brake filler and bleeder unit V.A.G 1869/ to the adapter.
Remove caps from the bleeder screws.

Fig 7: Identifying Collecting Bottle Bleeder Hose Connected To Rear Bleeder Screw

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Connect collecting bottle bleeder hose - 1 - to rear bleeder screw, open bleeder screw and allow the appropriate quantity to flow out (see table on side). Close bleeder screw.

Repeat procedure on left rear.

Fig 8: Identifying Collecting Bottle Bleeder Hose Connected To Front Bleeder Screw

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Connect collecting bottle bleeder hose - 1 - to front bleeder screw ^{* See footnote} , open bleeder screw and allow the appropriate quantity to flow out (see table on side). Close bleeder screw.

Repeat procedure on left front.

Table - Sequence / quantity of brake fluid

Sequence: brake wheel cylinder, brake caliper	Brake fluid quantity which must flow out of wheel brake cylinders or brake calipers:
Right rear	0.25 liter
Left rear	0.25 liter
Right front	0.25 liter
Left front	0.25 liter

Total quantity: approx. 1.25 liter

* Including brake fluid extracted from brake fluid reservoir and quantity from clutch slave cylinder.

Install cover caps on brake wheel cylinder and/or brake caliper bleeder screws.
Move filler lever on Brake filler and bleeder unit VAS 5234 or Brake filler and bleeder unit V.A.G 1869/ to position - B - (see operating instructions).
Remove filler hose from adapter.
Unscrew adapter from brake fluid reservoir.

Check brake fluid level and correct if necessary.
Install cap to brake fluid reservoir.
Remove brake pedal depressor.
Check pedal pressure and brake pedal free play. Free play: max. 1/3 of pedal travel