ASR Hold Pressure Control Mode

Fig 1: ASR Control Module, Pressure Hold

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The control process and valve positions shown in the figure relate to the RR brake. The ASR hold pressure control mode starts if a more powerful brake intervention is no longer required to prevent drive slip. The inlet solenoid valve (y23) is closed. As a result, the pressure in the brake caliper cannot be increased via the high-pressure/return pump (p2).