The ABS Contiques, at least the earlier ones, do indeed have pressure reducing valves. They are a different part number than the non ABS cars.
They might have been removed from production sometime in 99 when and if they transitioned to EBD (electronic brake force). With EBD, the reducers would not be needed as this was handled electronically. What I don't know is if Ford did indeed change to EBD with later Contiques.
If the car came with pressure reducers, DON'T REMOVE THEM! You risk having a car with unbalanced front to rear braking. No one enjoys having a car swap ends during hard braking.