Okay I’m working on installing a line lock in my 71.
One part of the directions states to measure the size of the tube nut going into the prop valve (that’s mounted on the frame rail), and that is the size of the tube to use.

Here is my question, and let me know if this doesn’t sound right at all...

I have 2 lines going into the prop from the master cylinder they are both same size tube nut (about 1/2")
The rear line is a 9/16" nut
Pass front is a 3/8" nut
Driver side is 9/16" nut

Is this correct?

Why would the manufacturer have 2 different size tubes and nuts for the front brakes? Does it have to do with the distance the fluid has to travel?

Thanks

Aaron