Abs Pressure Reduction Control Mode
The control process or valve positions shown in the figure relate to the FR brake. The ESP control module introduces the pressure reduction phase from the slip values of the braked wheels. The pressure reduction phase is introduced by actuating (opening) the solenoid valve (y9). The solenoid valve (y8) remains actuated (closed) in this control phase. During the pressure reduction phase brake fluid flows back into the high-pressure/return pump (p1) via the accumulator (11). From there the high-pressure/return pump in the front axle brake circuit delivers the brake fluid back to the master brake cylinder against the existing pressure. There is a silencer (12) for each brake circuit to damp delivery noise.