Modified Front Axle Speed Sensor (33/27)

MODIFIED FRONT AXLE SPEED SENSOR

TECHNICAL SERVICE BULLETIN

MODIFIED FRONT AXLE SPEED SENSOR

Model: All Mercedes Benz Models (except 300SL & 500SL)

Group: Axles

Bulletin No.: 33/27a

Date: May 1990

SERVICE INFORMATION

This S.I. contains additional parts information and model applicability. This S.I. supersedes S.I. 33/27. As of November 1989, a speed sensor with a modified wire mounting point is installed on the front axle.

A fixed sleeve in the area of the clamp-on mounting point prevents the wire from kinking. In addition, a red arrow on the sensor wire determines the position of the rubber grommet for proper positioning of the speed sensor cable.

Only the modified version will be available as a replacement part once the inventory of the previous version is depleted. When replacing the speed sensor on vehicles manufactured prior to the effective chassis end number, the bracket (29 and 32) and the ABS cable (57) must also be replaced (see Fig 1 ).

To replace the bracket (29) on model 126 vehicles, the brake line (5, Figure 2) must first be removed from the bracket. Upon installation of the new bracket, ensure that the proper brake line corrections are made and the front brakes are bled (42-010).

Fig 1: View of ABS Cable

Fig 2: View of Brake Line