Brake Bleeding: Service Precautions

Bleeding braking system

Bleeding the brake system is described for brake filter/bleeder unit VAS 5234.

Note:

- Bleeding the braking system on vehicles with ABS is carried out as for vehicles with conventional braking systems.
- Only use new brake fluid conforming to US standard FMVSS 116 Dot 4.
- Genuine VW/Audi brake fluid conforms to this specification.
- Brake fluid is poisonous. Also due to its corrosive effect brake fluid must not come into contact with paintwork.
- Brake fluid is hygroscopic, which means it absorbs moisture from the ambient air and should always be stored in air tight containers.
- Rinse of spillages, by using plenty of water.

To bleed the hydraulic unit, a pressure of at least 2 bar is necessary.