A Counterpersons Guide To ABS Speed Sensors

ABS Designs 03

Single Channel-Single Sensor


Single-channel, single-sensor ABS systems are the simplest form of ABS.  This system is commonly found on pickup trucks and vans with rear-wheel-only ABS control. It has one hydraulic channel which controls pressure to both rear wheels. It only needs one speed sensor, which is usually located in the rear differential. The rear wheels are monitored together and they both have to start to lock up before the ABS kicks in. In this system it is also possible that one of the rear wheels will lock, reducing brake effectiveness.

This system is easy to identify. Usually there will be one brake line going through a T-fitting to both rear wheels. You can locate the speed sensor by looking for an electrical connection near the differential on the rear-axle housing.

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