2008 BMW Z4 M Series Owner's Manual - Page 55

Malfunction The warning lamp for the brake system lights up in yellow. The drive-off assistant has failed. The car will not be held in place after the brake is released. Have the system checked as soon as possible. Initializing the system The initialization is completed while you are driving, and can be interrupted at any time. Initialization is continued automatically when you continue driving. When driving with snow chains, do not initialize the system.< 1. Start the engine immediately before pulling away, but do not drive off yet. Flat Tire Monitor FTM* The concept The Flat Tire Monitor monitors tire pressures while the car is being driven. The system reports any significant loss of pressure in one tire in relation to another. In the event of tire pressure loss, the rolling radius of the tire changes, thereby affecting the rotational speed of the wheels. This change is detected, and a flat tire warning is issued to the driver. System requirements To ensure a reliable flat tire warning, the system must be initialized with the correct tire inflation pressures. The system must be reinitialized each time a tire inflation pressure has been corrected or a wheel or tire has been changed.< 2. Press the button until the yellow indicator lamp in the instrument cluster lights up for a few seconds. 3. Drive off. Driving tips Reference Mobility Initialization is completed during the drive, without any feedback issued. Flat tire warning The warning lamp in the instrument cluster lights up in red. A signal also sounds. There is a flat tire or a significant loss of tire pressure. 1. Cautiously reduce speed to 50 mph/ 80 km/h or lower. Avoid strong braking and steering maneuvers. Do not exceed a maximum speed of 50 mph/80 km/h. If the car is not equipped with RunFlat Tires, refer to page 88, the standard equipment by design, do not continue driving. Otherwise a severe accident could result after a tire puncture.< 2. At the next opportunity, check the air pressure in all four tires. If the inflation pressure is correct in all four tires, it is possible that the Flat Tire Monitor was not initialized. In this case, initialize the system.< 53 System limitations The Flat Tire Monitor is unable to warn the driver of sudden, severe tire damage caused by external factors, nor can it identify the gradual loss of pressure that will inevitably occur in all four tires over a lengthy period of time.< The system could issue a false warning or function in a delayed manner in the following situations: > System was not initialized > Driving on a snow-covered or slippery road surface > Performance-oriented driving: slip at the drive wheels, high levels of lateral acceleration > Driving with snow chains attached Online Edition for Part no. 01 41 0 014 500 - © 08/07 BMW AG Controls At a glance