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ABS, fully integral function / part integral function

Correct braking technique is of crucial importance to motorcyclists, and it is only the combination of a reliable braking system technology with the acquired skills of the rider, which allows critical situations to be dealt with effectively. When suddenly in danger, even experienced motorcyclists tend to excessively brake the front wheel or lock the rear wheel, so a modern antilocking system (ABS) is a required active safety feature in any high quality motorcycle. All BMW Motorrad models are thus either fitted with ABS as standard or BMW Motorrad ABS is optionally available as a factory fit. This safety feature makes braking in the wet or in other dangerous situations, such as with a pillion and luggage, as simple and as safe as possible, whether you are a beginner or an experienced rider. The optimum braking distance is thus available at all times to the rider without the danger of the wheels being locked.

BMW Motorrad uses various ABS braking systems depending on the type of motorcycle. The F 650 GS and F 650 GS Dakar are the only single cylinder bikes to provide ABS optionally. In the K Series and the flat twin "boxer" models, two different types of the BMW Motorrad Integral ABS are used: the touring bike K 1200 LT is fitted with the ABS with full integral function, while all other models have the part integral function. In the R 1200 GS, R 1200 GS Adventure, F 650 GS and F 650 GS Dakar the ABS function can be deactivated for use on loose surfaces. In the R 1200 GS, the ABS function can also be switched off for use on race tracks, because here extreme situations occur in which a regulating ABS would impair the riding style.

All three systems reliably prevent the wheels from locking in the event of an emergency stop by means of an electronically controlled regulatory hydraulic system. Wheel sensors measure the rotational speed of the front and rear wheels and identify when the wheel begins to lock. The sensors pass on a measured impulse to a processor, which activates a pressure modulator in the hydraulic brake circuit of the front or rear wheel. The activated pressure modulator reduces brake pressure in a fraction of a second and then increases it once more. This means that the ABS applies just the right amount of brake pressure within the ABS range to the appropriate wheel as required to keep the wheel just short of locking point.

The BMW Motorrad Integral ABS also makes use of a brake booster in some cases, including the version I-ABSI. An electrically operated hydraulic pump supports the brake pressure generated via the brake lever and cylinder. From model year 2007, a new, more finely regulating system will be successively introduced which operates without a brake booster (I-ABS II). With the part integral brake system, the rider simultaneously activates the brakes of both wheels, with the footbrake lever only taking effect on the rear wheel brake. The fully integral brake system always decelerates both wheels, no matter whether only the hand or foot brake levers are being operated. Both systems provide a clear safety benefit in conjunction with ABS when compared to conventional braking systems, as has been frequently demonstrated in motorcycle tests. In the flat twin Enduros, the partially integral function remains in place even when the ABS is deactivated.

The central pressure modulator of the integral brake houses the electronic control system and the hydraulic system of the brake booster and the antilocking system. A total of three processors ensure maximum system reliability. Two microprocessors control the regulatory system in parallel, while a third performs a monitoring function. Whenever the ignition is switched on, the system runs a self-test while the ABS control lights flash in the cockpit. They switch off automatically as soon as the system transmits the relevant signal and the system is working error-free.