Service bulletin SD-13-4860

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

NHTSA's summary

Service Data - Bendix® WS-24™ Antilock Wheel Speed Sensor DESCRIPTION The Bendix® WS-24™ Wheel Speed Sensor (WSS) is an electromagnetic device used to obtain vehicle speed information for an antilock controller. When the wheel rotates, the sensor and an exciter ring (sometimes called a “rotor” or “tone” ring) generate a simple AC signal. This signal is sent to either the brake controller (Bendix® EC-60™ or Bendix® EC-80™) or the Global Scalable Brake Control electro-pneumatic modulator (Bendix® GSBC® EPM-90™), which analyzes the data and commands the Antilock Braking System (ABS) accordingly. Specifically, the WSS consists of a coil, pole piece, and a magnet. The exciter ring is a steel ring or gear-like device that has regularly spaced high and low spots called “teeth.” The WSS is mounted in a fixed position, while the exciter ring is installed on a rotating member (typically part of the hub) so that its “teeth” move, in close proximity, past the tip of the sensor. The WS-24 WSS is available in both straight and 90° versions to accommodate axle/wheel space limitations.

The document

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Components

Brakes

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