AFAIK all Focus, as a completely new model, used current Ford technology.
Originally Posted by Ford Service Training - Sensors and Actuators
Since the end of the 90s, so called active (magneto-resistive) wheel speed sensors have been used more frequently.
I don't know of any Focus that used the older 'passive wheel speed sensor' and a toothed wheel (same technology as the crank and cam position sensors).
Obviously this change over is a problem on other longer life/earlier models such as the Mondeo. Different ABS controllers and sensors across the model range, even in the same MY.
[hr]
danny_248, ST170 front disks are 300mm not 280mm.
What hoses are you fitting at the back (to drums)? The best scheme for a standard rear disc is a single 440mm hose (post 2002). It will work on a ST170 disc as well, though a bit tight on full travel. There are various hose/pipe/hose setups on earlier rear discs and also on the ST170/RS and having the right brackets and hoses can be great fun.
Martin