Greetings Alex,
If you want to test to see if the ABS system is causing your issue and you have checked everything and made sure that your conventional brakes and emergency brakes are working properly. You can simply remove the ABS fuse from the fuse panel and the ABS system will be disabled.
I would take a quick short slow ride and see if the issue is resolved or persists.
There is an additional feature on the Subaru's called Hill Holder if the spring on it breaks it will never fully return and cause the brakes to drag. ( I think this sounds more likely then and ABS issue. ) If the ABS was the cause you would feel it and see a light on the dash.
Try checking the Hill Holder system its typically on the left hand side from the drivers seat in a right hand drive in the engine compartment. I googled a picture for you of what they look like on the Subaru.
Let me know if I can be of more help!!
Cheers!!
Monte
[image|3181942]