Esp Pressure Reduction Control Mode
The control process and valve positions shown in the figure relate to the FR brake. The ESP pressure reduction control mode starts if the brake pressure required for stabilization is too high. The pressure reduction phase is introduced by opening the switchover solenoid valve (y9). The solenoid valve (y8) remains closed. The returning brake fluid flows back via the high pressure and return pump (p1) through the switchover solenoid valve (y18) to the brake fluid reservoir via the master brake cylinder. The self-priming high pressure and return pump (p2) is also actuated in all control phases.