Tech Tip: Preventing ABS Sensor Failure in Pigtail-Style Hub Assemblies

Tech Tip: Preventing ABS Sensor Failure in Pigtail-Style Hub Assemblies

In this technical bulletin, SKF provides updated technical information for preventing ABS sensor failure in pigtail-style hub assemblies. ABS system failures that happen shortly after hub unit installation can cause concern and customer dissatisfaction. Several items should be checked during the replacement process to prevent additional unnecessary repairs.

In this technical bulletin, SKF provides updated technical information for preventing ABS sensor failure in pigtail style hub assemblies.

ABS system failures that happen shortly after hub unit installation can cause concern and customer dissatisfaction. Several items should be checked during the replacement process to prevent additional unnecessary repairs:

• After removal of old hub unit, make sure the steering knuckle is clean from rust. Excessive rust can lead to improper seating of hub assembly.

• During installation, make sure the pigtail connector is routed correctly and not pinched in the knuckle.

• The connector clip must be completely seated on the backing plate. Failure to seat the clip will cause excessive movement in the pigtail wiring and internal damage will occur. The connector must also be properly secured to the harness connector.

• Make sure the weather pack has not fallen out of the harness. Replace if missing. Without the weather pack, water intrusion will occur damaging both the ABS sensor on the hub and the harness side wiring and connector. Visually inspect the connectors for signs of corrosion.

• Also note that during testing of the ABS system during a sensor failure, the ABS harness should be checked for breaks and/or resistance failures. A resistance check should be done from the ABS module to the end of the harness connector.

• During the final installation process, make sure the axle nut is torqued correctly.

Note: Incorrect torque can damage the sensor cap and allow for water intrusion.
Incorrect torque will also cause premature bearing failure.

Figure 1 shows a typical pigtail-style hub assembly with backing plate. This style is most common to GM vehicles. The arrows in the figure are pointing to the ABS pigtail and pigtail connector clip. The clip may be metal or plastic.

For more information about SKF and its premium quality products and services, contact your local SKF representative, or visit www.vsm.skf.com.

You May Also Like

Axle Torque Procedures

Guessing the correct torque setting is a bad idea.

The physics of all threaded fasteners are the same. As the bolt and nut are turned, the spiral threads convert rotational force into a linear force that creates clamping loads. When a threaded fastener is tightened, it stretches. Since metal is elastic, even greater clamping loads are generated. The threads also generate friction that keeps the assembly together. This especially applies to wheel bearings and axle nuts.

How To Answer Customer Ride Control Questions

Presenting your customer with inspection results and benefits of replacement will help sell the job.

Broken Springs

What is the cause for the failure? Why does it occur with specific vehicles? The answers might surprise you.

ADAS Module Programming

Reflashing and reprogramming is a necessary service for repairing vehicles.

Tuning Adjustable Shocks and Struts

Let’s take a closer look at adjustable shocks and struts, what they do, and how one should go about adjusting them.

Other Posts

What Do The Marketing Messages Mean?

Certain messages mean certain things – or not. When selecting automotive components, do your homework.

.01 Micron Superstar Filter

The .01 Micron SuperStar Filter includes a differential pressure gauge and comes with mounting brackets.

Tesla Air Ride Service

Tesla’s air suspension is “smart” because it uses GPS information and vehicle speed to adjust suspension ride height.

Advanced Wheel Bearing Diagnostics

Can a bump set a wheel speed sensor code?