Brake line sizes

[Wisconsin_Snake]

What is the appropriate brake line (hard line) size to be used for the front and rear brakes if different?
I asked because when I hooked up the lines to the brake distribution block, the lines going from the block to the calipers are all 3/16.
The brake distribution block had 3/16 output going to the brake...

Now the brake hose going to the calipers is 1/4 so that got me thinking I may not be plumbed properly.

Thanks

[joyridin']

Usually most car builders and companies recommend 3/16".