Mercedes-Benz Recall 2004050014: Mercedes Benz/Sbc Hydraulic Unit
2004 Mercedes-Benz SL500
If vehicles are not routinely serviced and have extremely high mileage combined with a high number of brake actuations, or a high brake actuation frequency, the pump motor of the sbc may run out of permissible tolerances, thereby triggering the hydraulic function mode.
On certain vehicles, the electronic monitoring system of the sensotronic brake control (sbc) is designed to monitor the pressure gradient within the high pressure line of the brake system. If an unacceptable pressure gradient is detected, the system will switch, as it is designed to do, into the hydraulic function mode.