The ST170 does have ABS, the ABS Sensor is in the back of the stub axle, there is an identical load sensing valve on the driver side wishbone too, i always thought they were related to the traction control as when i purchased new wishbones and rear lower control arms they did not have the rivnuts to attach the sensors to so i had to modify them to take the sensor?? This is why i was suprised a 2.0l non ST focus had traction control. Maybe they are for ESP which was an option but they are not in use as i only have TC Confused