Using the test card, it’s possible to visualise the magnetic pattern produced by the encoder ring, that’s built into to the wheel bearing. These are embedded under the seal, so a visual inspection won’t do. Using the ATE Test Card, bad sectors in the magnetic field are quick and easy to identify. Click on the image fileS below to see how.
This makes it possible to test the bearing unit independently from the sensor, as the magnetic field of the encoder ring can break down. This will lead to the ABS wheel speed sensor reading inaccurately. But it’s easy to assume the sensor needs replacing, when the fault may be in the bearing.
The test card should also be used to check bearings are inserted in the correct orientation, and to double check the encoder ring is good before fitting a new bearing.
This simple, low-cost tool can save time when diagnosing ABS issues & ensure repairs are carried out correctly first time.
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