Honda Motorcycles

Two types of CBS, Combi Brake (Single CBS) and dual CBS

Honda's CBS can be largely classified into two types; Combi brake adopted for scooters, medium sized motorcycles and American custom models and dual CBS used by large sports and large tourers.

The main purpose of the two types is the same; to increase the deceleration obtained on appllication of the pedal brake (or the left lever), which was previously relatively lower during the application of the rear wheel brake alone. To achieve the purpose, it was made possible to apply the brakes simultaneously on the front and rear wheels by operation of the pedal (or the left lever). In case of dual CBS, furthermore, it was made possible to apply the brakes simultaneously on the front and rear wheels when the right lever was operated, to reduce nosedive.

Dual CBS for large sports tourers

Honda has further advanced Combi Brake, which will work simultaneously on the front and rear wheels by operation of the pedal (left lever) only, to develop dual CBS for application to much larger sports models. Based on the front double disk brake and rear disk brake, this not only brakes the front and rear wheels at the same time by applying the pedal, but also applies braking force on the rear wheel when the right lever is operated. The dual CBS enabled to efficiently decelerate and reduce nosedive.

Two types of combined ABS combining CBS and ABS

Honda is now using two types of ABS for motorcycles, ABS using circulating type modulator widely used in automobiles and ABS used exclusively by motorcycles with modulators driven directly by motors. There are cases of using those two types of ABS as they are for the conventional brake system and of using them in combination with CBS as combined ABS, aiming at installation of ABS on many models. For the combined ABS for large scooters, circulating type modulators partially improved for motorcycles were adopted for "Combi brake". For large tourers, combined ABS capable of giving higher braking force was completed, combining modulators directly driven by motors with dual CBS.

Merits of Combined ABS

Advanced brake systems developed by Honda so far, CBS and ABS, were merged as combined ABS to enable to produce a greater effect. The figure below shows a comparison of maximum deceleration generated by operation of the pedal alone in a model between the conventional brake and the advanced brake systems. The deceleration generated by the pedal operation in the conventional brake system is approximately 0.4G (1G = 9.8m/s2). As against to it, the deceleration is increased in CBS by about 1.7 times by obtaining braking force of the front wheel. In case of combined ABS, furthermore, the deceleration is increased as much as approximately 2.3 times.

Development of the ECU-integrated throttle body module

To allow for application to a small motorcycle, the FI system had to be simplified and down-sized considerably from the conventional one. The development team packed various functions into the compact yet simple system that could be installed in the place of a conventional carburetor by modularizing the throttle body, various sensors, and the engine control unit (ECU) into an integral unit.

Honda Motorcycles

Two types of CBS, Combi Brake (Single CBS) and dual CBS

Dual CBS for large sports tourers

Two types of combined ABS combining CBS and ABS

Merits of Combined ABS

Development of the ECU-integrated throttle body module

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