Based on the information in the Subaru manual, I think Goldwing's interpretation is correct. The ABS module has 2 inputs and 4 outputs. If you pull the fuse, you still get braking from all 4 wheels. This means the system is passing the existing pressure from the master cylinder through the 2 inputs to all 4 outputs. Therefore, there must be some kind of splitting going on inside. It doesn't make sense to have the splitting one way (i.e. Input 1 goes out to FR & RL) when ABS is engaged, and another way (i.e. Input 1 goes to FR & FL) when ABS is not engaged. Why do that? And the ABS circuit isn't the only thing that could fail (one of the outputs from the master, as weil as any of the inputs or outputs from the ABS unit could fail). If they went to trouble to address failures of the ABS system to ensure balanced braking, it stands to reason they would simply plumb it that way and get the same benefit for other failures.