There are many videos, but this is a simple good article on brake systems. One thing to keep in mind not normally considered is, that in a dual cylinder the primary piston needs to build pressure first in order to get the secondary piston to move, which could take some extra travel. since the pistons are connected in series, I wonder if it makes a difference as to whether the primary should be hooked to rear, or front brakes depending on which end builds pressure first? I guess I always hooked the primary to the rear since it is the rear port if it even makes a difference.
Especially on a disc/drum setup.
How Master Cylinders and Combination Valves Work | HowStuffWorks