Technical information

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Technician Guidelines for Antilock Braking Systems

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B. ABS Maintenance and Inspection

1. ABS Sensor Pickup Adjustment

CAUTION: Follow all recommended safety warnings and

cautions. To prevent eye injury, always wear safe eye

protection when performing maintenance or service. Do not

work under a vehicle supported only by jacks. Jacks can slip or

fall over and cause serious personal injury.

To adjust the ABS sensor pickup, gently push the sensor

pickup in until it contacts the tooth wheel:

• On the steering axle, the sensor pickup may be acces-

sible on the in-board side of the steering knuckle.

• On the drive axle, the wheel and drum assembly must

be pulled to gain access to the pickup. Prior to pulling

the wheel and drum assembly, observe the output

voltage of the pickup while rotating the wheel by hand.

The amount of output voltage is dependent upon the

sensor pickup gap and wheel speed. Refer to the

manufacturer’s recommendations for proper voltage

levels.

2. ABS Sensor Pickup Removal & Installation

The following installation and removal procedure is a

guideline only. When removing or installing a sensor pickup on

your system, always follow the procedures detailed in the

manufacturer’s maintenance manual.

3. Sensor Pickup Removal—Front Axle

To remove the sensor pickup from the front axle:

1.Put wheel chocks under the rear tires to keep the

vehicle from moving. Apply the parking brake.

2.Remove the pickup and spring clip from the steering

knuckle. Use a twisting motion if necessary. Never

pull or tug on the cable.

3.Disconnect the pickup cable from the chassis harness.

Be careful not to criss-cross wiring.

4. Sensor Pickup Installation—Front Axle

To replace the sensor pickup in the front axle:

1.Connect the sensor cable to the chassis harness. Be

careful not to criss-cross wiring.

Typical Sensor Assembly