When motorcycle drivers apply full braking, the dynamic changes in wheel load can cause the rear wheel to lift. To address this problem, all motorcycle versions of the generation 9 ABS evaluate how much each of the two wheels is slipping. If there is a danger that the motorcycle will roll over, the braking pressure on the front wheel is reduced. Bosch has integrated an additional pressure sensor into the new ABS 9 plus, which registers the braking pressure applied by the driver and can thus detect earlier if the rear wheel is lifting. The system can react more quickly.
World’s first ABS series built exclusively for motorcycles
Previous anti-lock braking systems for motorcycles were adapted from passenger-car systems, with small technical adjustments made. On the basis of the new generation of Bosch brake control systems for passenger cars, Bosch’s engineering center in Japan has now designed a standalone ABS series for motorcycles. The motorcycle ABS has a modular structure, allowing it to be adapted for a variety of function ranges: from the basic ABS 9 base version to the ABS 9 plus and the ABS 9 enhanced, which uses electronic combined braking system. The latter version makes it possible to brake both wheels, and allows an electronically controlled variable distribution of braking pressure, even when the driver applies only the front or rear brake.
All ABS systems for motorcycles are extremely compact. The pump housing, for example, is now considerably smaller, as it only has to house the control technology for two wheels instead of four. The control unit’s printed circuit board is mounted directly on the hydraulic unit, which increases vibration resistance. Due to shorter brake lines and smaller brake pistons, a recently developed, more compact return pump is sufficient. The result is that the system is now lighter and 50 percent smaller than its predecessor. The brake lever also vibrates less, and the system adapts the braking pressure even more quickly to the coefficient of friction between the wheels and the surface beneath them.
Bosch has been manufacturing antilock braking systems for motorcycles since 1994. There have been numerous improvements and further developments since then, and Bosch has delivered more than 350,000 antilock braking systems for motorcycles.