Brakes - Sensotronic Brake Control (SBC) Bleeding Proc.
Date: December 16, 2004Order No.: P-B-42.46/46b
Supersedes: P-B-42.46/46a dated Oct. 28, 2004
Group: 42
Revision: Equipment Addition
SUBJECT:
Model 211.026/065/070/076/082/083/265/282/283
Model 230.474/475/476/479 All Model Years
Sensotronic Brake Control (SBC) Bleeding Procedure
Note:
For Information Only
On the above model vehicles, the SBC brake system must be bled with the menu-assisted STAR Diagnosis after the replacement or removal/installation of the following components: SBC hydraulic unit (A713), Brake Operating Unit, Suction Line, Pressure Reservoir, Brake Lines, Brake Fluid Reservoir, Brake Hoses, or Brake Calipers (Reference WIS documents AH42.10-P-0002-O1T and AR42.10-P-0012R). When performing repair work on a Sensotronic Brake Control (SBC) system, it is imperative that the brake system only be bled with Mercedes-Benz approved Brake Bleeders. The SBC bleeding procedure requires that the filling and bleeding unit must maintain a constant pressure of greater than or equal to 2 bar and < 3.5 bar. In conjunction with the approved brake bleeder, the electrohydraulic brake adapter (EHB) tool must also be utilized in order to ensure that the brake fluid receptacle bleeding hose is securely affixed to the brake caliper's bleeder screw (Reference WIS document AR42.10-P-0010-02R).
Warning!
The SBC filling and bleeding unit pressure must not exceed 3.5 bar.
Note:
Follow all instructions and test sequences listed within STAR Diagnosis prior to bleeding the SBC system.
Warning!
If the brake system has been opened, then the brakes must be bled and checked for air using STAR Diagnosis Bleed Brake System" and Inspect Brake System For Air" functions before the brake system is activated again. This must be done regardless of what other operations were performed on the brake system. Failure to do so can lead to malfunctions of the brake system.
Warning!
Air contained in the brake lines reduces brake performance and can lead to malfunctions of the SBC system.
Note:
Labor operation times for code 42-1354 - "Hydraulic Brake System - Vehicles With SBC, Bleed", includes the STAR Diagnosis operation Inspect Brake System For Air".
Approved Mercedes-Benz Brake Bleeders continue to be available via the MBUSA Standard Service Equipment Program (SSEP).
The specialized brake bleeding procedure of the SBC system requires that specific Service Equipment and/or Special Tools be used in order to effectively bleed the SBC system. MBUSA has taken steps to also make this Service Equipment available as an MBUSA Special Tool and then automatically ship a pressure bleeder and EHB adapter to all dealers that did not already have this approved (and required) brake Service Equipment.