Such features made this system capable of controlling the brake pressure on each axle individually. Identical to the layout used by Toyota, this system also has a pedal feel simulation device that has a similar design to that of Toyota. The electric booster is a tandem master cylinder with its push rod connected to a ball screw structure driven by an electric motor. Honda (Minato, Tokyo, Japan) mounted a braking system powered by an electric booster together with its i-MMD hybrid powertrain, which is the same as that used on the Accord Hybrid. This system is characterized by a fully by-wire hydraulic control unit and a pedal feel simulation mechanism, making it able to adjust the pressure in each wheel cylinder precisely and independently. Toyota (Toyota, Aichi, Japan), cooperating with ADVICS (Kariya, Aichi, Japan), implemented an electro hydraulic braking system in the Prius. This system is capable of performing regenerative braking while the pedal feel will be affected when the electric motor is engaged. Mando designed a system that consisted of a vacuum booster, an electric vacuum pump, and a modified Electronic Stability Control (ESC) hydraulic control unit that had two extra valves, but had no pedal travel simulation mechanism. This system could be used on an electric vehicle to perform regenerative braking on the front axle. (Cleveland, OH, USA) developed a braking system with a controllable hydraulic booster that could control the pressure in the front calipers.

In terms of system architecture, researchers in universities and top tier automotive part suppliers have proposed serval schemes: TRW Inc.

Research on both the hydraulic system layout and control method has been conducted using an electrohydraulic braking system as the cooperating friction braking system.

This cooperating friction braking system needs to have the ability to regulate the braking force it produced to avoid causing an uneven feeling due to the intervention and withdrawal of the motor braking force during a braking process.

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