How are the brake lines routed on my 93 taurus sho?

The brake lines coming out of the master go to a proportioning valve below the master (mounting block you call it)...from there, they split off to the front wheels and to a tee fitting in the rear for the 2 rear wheels. The proportioning valve balances the pressure betwen the front and rear systems and prevents fluid loss in case one of the front or rear systems leaks so you 'll retain some braking pressure.