GF00.20-P-3009SX Brake Lining Wear Calculation, Function

GF00.20-P-3009SX Brake Lining Wear Calculation, Function
- MODEL 221.0 with ENGINE 156, 272, 273, 629, 642 up to Model Year 8
- MODEL 221.1 with ENGINE 156, 272, 273, 275, 629, 642 up to Model Year 8
- MODEL 216.3 with ENGINE 273, 275 up to Model Year 8

The wear of the front axle brake linings is detected via a right front brake pad contact sensor (S10/2), which is located on the right front brake caliper. The wear of the rear axle brake linings is detected via a right rear brake pad contact sensor (S10/4), which is located on the right rear brake caliper. The right front brake pad contact sensor is read in via a discrete line by the front SAM control unit with fuse and relay module (N10/1). The right rear brake pad contact sensor is read in via a discrete line by the rear SAM control unit with fuse and relay module (N10/2). Both pieces of status information are forwarded to the central gateway control unit (N93) via the interior CAN. These pieces of status information are forwarded centrally to the integrated module for the Active Service System PLUS (ASSYST PLUS).

The ASSYST PLUS administers the status of the contact sensors and forwards a corresponding message to the instrument cluster (A1) via the central CAN when the minimum has been reached, which indicates a point in time during which the contact sensor just touches the brake disk. The instrument cluster issues a corresponding message to the driver via the multifunction display (A1p13). The ASSYST PLUS senses additional data for the calculation of the remaining distance, which permits the system to draw conclusions on the driver's vehicle handling in order to calculate, how long the brake lining, for which the minimum has been recognized using the right front brake pad contact sensor or the right rear brake pad contact sensor, will probably last.

This piece of status information is administered in the ASSYST PLUS and output upon request by the maintenance staff as a workshop code. Via the instrument cluster, the workshop code can be read out and this can be entered into the Workshop Information System (WIS). WIS breaks down this workshop code and determines the service scope and the additional operations to be performed for the vehicle. These additional operations are then preselected in the WIS.