Disc Brake Plumbing - Master Cylinder

[Spikehaus]

Hi Gents

Does anyone have a schematic for the brake pipe plumbing for a disc brake arrangment. I was looking at my sierra master cylinder and could not figure out why it has three outputs? Which one goes where?

I have the tee peices, pressure switch and a bias valve. I have also fixed the flexi pipes and and fitted the copper pipes the rear tee. Should the bias valve be located near the master cylinder?