Brake systemBrake system  - Warning and indicator lamps - Controls - Audi A5 Owner's Manual - Audi A5

The warning lamp flashes if the brake fluid level is too low or if there is a fault in the ABS system or the parking brake.

If the warning lamp is a fault in the brake system. flashes, there is a fault in the brake system.

The symbol display will flash at the same time. You can press the SET button to obtain a message in the instrument cluster display will flash at the same time. You can press the SET button to obtain a message explaining the fault.

If a failure should occur in the ABS, the ABS warning lamp warning lamp will light up together with the brake warning lamp . WARNING.

 Before opening the bonnet and checking the brake fluid level, observe the WARNING

Before opening the bonnet and checking the brake fluid level, observe the warning information on, Working on components in the engine compartment.
If the brake warning lamp does not go out, or if it lights up when driving, the brake fluid level in the reservoir is too low this may cause an increased accident risk. Stop the vehicle and do not drive on. You should obtain professional assistance.
If the brake warning lamp lights up together with the ABS warning lamp, this can mean that the control function of the ABS is out of action. As a result the rear wheels can lock relatively easily when braking. This could cause the tail of the vehicle to skid sideways. Drive carefully to the nearest qualified workshop and have the fault rectified.