Wheel Speed Sensor Replacement
What is an ABS wheel speed sensor?
The wheel speed sensor is the primary data source for the ABS system. In order for the anti-lock brake (ABS) control module to react to driving conditions, wheel speed sensors (WSS) are placed on all four wheels, and constantly transmit the speed of each wheel to the ABS control module. They are mounted in the hub, close to the brake calipers, where they can monitor how fast the axle is turning.
How does the ABS wheel speed sensor work?
They are mounted in the hub, close to the brake calipers, where they can monitor how fast the axles are turning. All four WSS work in unison by providing four independent signals to the ABS control module, which allows the control module to correct for slipping if one or more wheels stop rotating. This action is responsible for highly reduced braking distances in slippery conditions.
What are the symptoms related to a bad ABS wheel speed sensor?
In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.
Can I drive with a ABS wheel speed sensor problem?
The vehicle can be driven with these warning lights on, since failure of the ABS or TCS does not disable the vehicle, but safety is a concern as drivers become accustomed to the road manners of their vehicle's. If hard braking that is normally controlled by the ABS control module is necessary, a collision may occur. We do recommend towing the vehicle to a repair facility if braking feels unusual under light or normal driving conditions.