Brake fluid change Audi A4 8K (Solution)

This model features a reservoir for brake fluid that is divided into multiple chambers, with a separate chamber specifically for the clutch hydraulics.

The threshold for overflow from the main chamber (into which you add liquid) is set very high. So high that, with a sufficiently full container, nothing can spill out.
The volume of the chamber is then insufficient to allow for the fluid change in the clutch hydraulics as specified by the manufacturer (150 ml). You can't replace the filling in one go; instead, you pump air into the system.

Therefore, when changing the brake fluid or bleeding the brakes, it is essential to monitor the fluid level. It's best to fill the container completely to the brim beforehand.

hg
Herbert.

Brake fluid reservoir, Audi A4, 8K.