Brake systemBrake system  - Warning and indicator lamps - Instruments and warning/indicator lamps - Controls - Audi S5 Owner's Manual - Audi S5

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 cluster display will flash at the 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 light up together with the brake warning lamp will light up together with the brake warning lamp .WARNING.

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.

When the needle reaches the reserve zone, the symbol  lights up in the instrument cluster display together with the message Please refuel. At this point there are still about 8 litres of fuel left in the tank. This is your reminder to fill up soon.

The tank capacity of your vehicle is given in the Technical data section.

Caution
Never run the tank completely dry. If there is an irregular fuel supply, misfiring can occur. This allows unburnt fuel to enter the exhaust system, which could cause overheating and damage the catalytic converter.