SMU - Revised Wheel Speed Sensor Replacement

This bulletin is being issued to revise the Wheel Speed Sensor Replacement in the Antilock Brake System sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

The following information has been incorporated into the Installation steps of the Wheel Speed Sensor Replacement procedure; it does not replace that procedure.

The proper installation of the wheel speed sensor (WSS) is critical to prevent corrosion from beneath the sensor. When installing a new WSS, the mounting surface must be free from any rust of corrosion. It is recommended that once the sensor is removed, the WSS bore should be plugged to prevent debris from falling into the hub. Once the WSS bore is plugged, a wire brush or equivalent should be used to clean the WSS mounting surface on the hub. After the mounting surface is free from all corrosion, apply a thin layer of wheel bearing lubricant, GM P/N 01051344 (in Canada, 993037) to the hub surface and the sensor O-ring prior to installation.