Vehicle care 169The brake fluid level must be betweenthe MIN and the MAX marks.When topping up, ensure maximumcleanliness as contamination of thebrake fluid can lead to brake systemmalfunctions. Have the cause of theloss of brake fluid remedied by aworkshop.Only use high-performance brakefluid approved for the vehicle.Brake and clutch fluid 3 208.Vehicle batteryVehicles without stop-start systemwill be equipped with a lead acidbattery. Vehicles with stop-startsystem will be equipped with anAGM battery which is not a lead acidbattery.The vehicle battery is maintenance-free provided that the driving profileallows sufficient charging of thebattery. Short-distance-driving andfrequent engine starts can dischargethe battery. Avoid the use ofunnecessary electrical consumers.Batteries do not belong in householdwaste. They must be disposed of atan appropriate recycling collectionpoint.Laying up the vehicle for more than4 weeks can lead to batterydischarge. Disconnect the clamp fromthe negative terminal of the vehiclebattery.Ensure the ignition is switched offbefore connecting or disconnectingthe vehicle battery.The anti-theft alarm siren must bedeactivated as follows: Switch theignition on then off, disconnect thevehicle's battery within 15 seconds.Vehicle battery discharge protection3 121.Replacing the vehicle batteryNoteAny deviation from the instructionsgiven in this paragraph may lead toa temporary deactivation of the stop-start system.When the vehicle battery is beingreplaced, please ensure that thereare no open ventilation holes in thevicinity of the positive terminal. If aventilation hole is open in this area, it