Ah cheers bud. Thing is at the moment I've got all standard brakes but the pedal goes all the way down and have zero braking really. There's no air in the system so I was thinking it must be the master cylinder. Have you ever come across any problems?
It's most likely the abs unit needs bleeding. As far as I'm aware there are two ways to do this. Find somewhere slippery and stomp on the brakes or use dealer/copy software and a cable to cycle the valves in the pump
That's a point, when the calipers are mounted further away from the hub (with brakes bigger than oem) standard length braided lines pull uncomfortably tight on full lock with the suspension loaded. Keep a close eye on them and if you see any signs get longer ones made up