[roadrnnr]

I have an 87 Astro (Rustro). I need to replace the rear brake lines. What dia. tubing and what size fittings are required. I want to go from master cylinder back.

 

[gtkane]

I believe the line size is 5/16" with standard size fitings.

 

[astro355]

Yep, 5/16" would be correct. I just got done replacing my brake lines.