IIRC residual check valves are used to hold a little pressure like 10 pounds in your brake lines and cylinders so your braking ability is quicker and Also so the fluid won't drain back to your master cylinder. The valves are usually just inside the outlet ports on your master.
With a 2" bore you'll have fun stopping without assist.
If you put a master on that has no valves in it you can plumb some inline residual valves into your lines. Napa or Summit have them.
