Brake line size

[fiero_fighter]

From the proportioning valve to the rear distribution block what's the line size?

[can machine]

I measured mine. It looks like 1/4 to me.

[aaron88]

That's right...1/4"

[fiero_fighter]

yep checked it tonight, 1/4"...   next project, as the brakes are already apart...  line lock.  my mechanic buddy is laughing at me but...  the plan is to install a manual line lock.  I come from a recent 4x4 back ground(97 5.9 gas ram with 8" lift, custom 200lbs bumper with 12000lb winch etc..), so a manual line lock represents a much lower failure rate than electronic... picked up a 6000 psi valve today from one of my suppliers, so I'll be plumbing it in this weekend.   I'll try to post full pics of the upgrades.

[aaron88]

After they split they are 3/16, but you can use 3/16 all the way back if you want.  It's not a high volume system.