There is no need to change the line size to the rear if you are sticking with the stock rear brakes. GM used the 3/16 line until the mid 60s. My 1965 C10 has the same size line.
Goin with ABS disc brake system still noob on the whole brake system first time doing a restoration and full brake system. Looks like I’ll be running 1/4 line and splitting it to 3/16 learning a lot along the way. Thanks guys just put in master cylinder doing a whole
Overhaul on front and rear suspension and full brake system.