Tech Tip: Intermittent ABS Operation Caused by Cracked Sensor Ring

Tech Tip: Intermittent ABS Operation Caused by Cracked Sensor Ring

Rust can develop between the axle and the ABS speed sensor ring. The rust acts like a wedge and causes the ring to crack, creating a false or erratic signal that results in intermittent ABS operation.

Application: Vehicles equipped with ABS (Anti-Lock Braking System) sensor rings located on the outer drive axle joint. See Fig. 1. Figure 1

Problem: Intermittent ABS failure or trouble codes.

Cause: Rust can develop between the axle and the ABS speed sensor ring. The rust acts like a wedge and causes the ring to crack, creating a false or erratic signal that results in intermittent ABS operation.

Solution: Closely inspect the sensor ring for cracks or damage to the teeth. If any defects are found, ­replace the sensor ring or CV drive axle.

Note: Always remove any metal particles on the magnetic portion of the sensors.

Courtesy of CARDONE Industries.

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