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AKEBONO BRAKE has developed a compact, light weight, and wide range applicable 3 and 4 channel ABS modulator. The authors believe it may be the smallest and the lightest design in the world, without any trade-off of function and performance. This has been achieved by adopting rational components layout with an originally developed small 3-position solenoid valve which is approximately one half in size compared with other known designs.

When vehicles equipped with part-time four-wheel drive (4WD) are in the 4WD phase, the front and rear drive shafts are rigidly engaged. This rigid engagement of these drive shafts requires that the sum of front right and left wheel speeds equal the sum of the rear right and left wheel speeds. However, with vehicles equipped with standard anti-lock brake system (ABS) which control the front/rear wheels independently, the front/rear wheels rotation sums may become unequal during braking due to the ABS's independent modulation of the front/rear wheels. This causes the torque interference of the drive shafts and unanticipated torque transfer over the brake torque. Consequently, the ABS control of wheel slippage becomes difficult. AKEBONO proposes one of the solutions to this problem using a diagonal 2 channel, 4 sensor ABS arrangement where each channel monitors diagonal front and rear wheel speeds.