Audi Cars 1999-05

Bleeding the Brake System


The following procedure is for models not equipped with Anti-lock Braking Systems (ABS).

The brake fluid should be replaced at least every 2 years as it is hygroscopic and absorbs moisture from the ambient air. Always keep brake fluid in a sealed container. Only use a brake fluid that meets the US standard FMVSS 116 DOT 4.

Brake fluid is poisonous and corrosive. Avoid spilling brake fluid on the vehicle's paint. It will damage the finish. If a spill does occur, wash it immediately with water.

The purpose of bleeding the brakes is to expel air trapped in the hydraulic system. The system should be checked for fluid condition, brake hose condition and air whenever the pedal feels spongy. The system must be bled whenever it has been opened, repaired, or a hydraulic component replaced. If you are not using a pressure bleeder, you will need an assistant for this job.

NEVER reuse brake fluid that has been bled from the brake system. Brake fluid absorbs moisture that can lower its boiling point, therefore re-using old, used, or contaminated fluid can decrease the effectiveness of the braking system.