Brake Booster/Brake Master Cylinder: Note
WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Make sure that the actuator pin -15- for the brake lamp is pushed in the brake master cylinder -2- before installing the brake master cylinder -2-. If the actuator pin -15- is missing the brake lamp will not function.
The actuator pin must always be pushed in the hole in the brake master cylinder directly on the Brake Lamp Switch -F-.
The actuator pin must not be bent or broken.
If this pin is missing or is damaged, the brake lamp will not function.
The actuator pin function is only for the brake lamp.
If the actuator pin is bent, broken or missing, then the brake booster must be replaced.