Whats the difference between four wheel ABS and rear wheel ABS?
Four wheel ABS is used on passenger cars and some light trucks and vans. Rear wheel ABS is used only on trucks. Rear wheel antilock systems are typically used on applications where rear wheel traction is affected by vehicle loading. Rear wheel ABS systems are simpler and less costly than their four wheel counterparts. On a four wheel application, the ABS system keeps track of wheel deceleration rates with wheel speed sensors. Some have one speed sensor at each wheel while others use a common sensor in the differential or transmission for both rear wheels. With rear wheel ABS, only a single wheel speed sensor in the differential or transmission is used for both rear wheels. Four wheel ABS systems include those made by Bendix, Bosch, Delco Moraine, and Teves. Most rear wheel ABS systems are made by Kelsey-Hayes, though Kelsey-Hayes also makes some four wheel systems. Kelsey-Hayes rear wheel ABS systems have been in use since 1987 on Ford F series trucks, as well as later model Ranger, Br
