What happens when the wheel speed sensor in a hub unit affects the ABS system?
If a sensor becomes damaged or has malfunctioned, the system is meant to revert to normal braking mode. This means the ABS system will shut down if trouble is detected. The wheel hub unit will continue to operate in its normal function. It is safe to drive on the hub unit, but the ABS system should be checked at your earliest opportunity. Since a wheel cannot be steered unless it is rolling, a locked wheel offers no steering control of the vehicle. ABS restores steering control by quickly applying and releasing pressure on the affected wheel or wheels. What does bearing play have to do with air gap in the wheel speed sensor? The tone ring on most hub units is on the internal moving parts. As the bearings wear out or are damaged, the air gap changes. In extreme cases, internal and external sensors can be damaged from excessive movement caused by too much endplay. This indicates a lack or loss of bearing clamp. This normally results from severe mechanical break up or damage. The internal
