You'll probably find the lines from the master cylinder to the tee blocks are 1/4", and lines to the wheels are 3/16". Here's a little sneaky trick if you've got a tight raduis bend to make. Fill the line with melted soft solder, make the bend around a piece of round rod, and then melt the solder out with a propane torch. I've used that trick when I needed a radius too tight to make with a bender. Compressed air helps when getting all the solder back out of the line.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!